diff --git a/components/form.php b/components/form.php
index 9adedbd..63be154 100644
--- a/components/form.php
+++ b/components/form.php
@@ -1,5 +1,6 @@
 <?php
 require_once __DIR__ . '/browser-upload.php';
+require __DIR__ . '/upload-error.php';
 echo '<script>', require __DIR__ . '/navigation-guard.php', '</script>';
 echo '<script>', require __DIR__ . '/upload-recovery.php', '</script>';
 
@@ -20,7 +21,7 @@ $basePickerAccept = 'image/jpeg,image/png,image/gif,image/webp,image/bmp,image/a
 		<div class="dropzone-form-icon">
 			<img src="<?= $assetsUriPrefix; ?>/images/dropzone-icon.svg" alt="" height="65" width="64">
 		</div>
-		<div id="form-title" class="dropzone-form-text index-upload-heading"><?= Yii::t('app', 'Улучшить изображение') ?></div>
+		<div id="form-title" class="dropzone-form-text index-upload-heading"><?= Yii::t('app', 'ИИ улучшение изображений') ?></div>
 		<div class="dropzone-form-format">
 			<div class="dropzone-form-format-label"><?= Yii::t('app', 'Поддерживаемые форматы') ?>:</div>
 			<div class="dropzone-form-format-list">
@@ -242,9 +243,9 @@ $basePickerAccept = 'image/jpeg,image/png,image/gif,image/webp,image/bmp,image/a
 					catch (_) { showUploadError(genericErrorMsg); }
 					return;
 				}
-				showUploadError(genericErrorMsg);
+				showUploadError(genericErrorMsg, false, xhr.status === 408 || xhr.status >= 500);
 			};
-			xhr.onerror = () => { if (attempt === uploadAttempt && !leavingUploadPage) showUploadError(genericErrorMsg, true); };
+			xhr.onerror = () => { if (attempt === uploadAttempt && !leavingUploadPage) showUploadError(genericErrorMsg, true, true); };
 			xhr.send(formData);
 			} catch (_) { if (attempt === uploadAttempt && !leavingUploadPage) showUploadError(genericErrorMsg); }
 		}
@@ -308,33 +309,27 @@ $basePickerAccept = 'image/jpeg,image/png,image/gif,image/webp,image/bmp,image/a
 					try { await recovery.accepted({id: imageId}); redirectToTour(record); }
 					catch (_) { showUploadError(genericErrorMsg); }
 				} else {
-					showUploadError(genericErrorMsg);
+					showUploadError(genericErrorMsg, false, xhr.status === 408 || xhr.status >= 500);
 				}
 			};
 
 			xhr.onerror = () => {
-				if (attempt === uploadAttempt && !leavingUploadPage) showUploadError(genericErrorMsg, true);
+				if (attempt === uploadAttempt && !leavingUploadPage) showUploadError(genericErrorMsg, true, true);
 			};
 
 			xhr.send(formData);
 		}
 
-		function showUploadError(msg, keepRecovery = false) {
+		function showUploadError(msg, keepRecovery = false, connection = false) {
 			if (leavingUploadPage) return;
 			uploadAttempt++;
 			if (!keepRecovery) clearRecovery();
 			resetUploadPending();
 			form.show();
-			if (typeof preview !== 'undefined' && preview) {
-				preview.show(); preview.showError(msg);
-				if (!preview.sourceEl.getAttribute('src')) preview.sourceEl.style.display = 'none';
-			}
-			// Release sentinel восстанавливает scroll history. Показываем сообщение
-			// после этого перехода, иначе браузер тут же возвращает верх страницы.
-			window.PublicNavigationGuard.allowNavigation(() => requestAnimationFrame(() => {
-				if (typeof preview !== 'undefined' && preview) preview.upscaleErrorOverlay.scrollIntoView({block: 'center', behavior: 'instant'});
-			}));
 			fileInput.value = '';
+			window.PublicNavigationGuard.allowNavigation(() => {
+				window.ZoomzillaUploadError.show(msg, connection);
+			});
 		}
 		window.addEventListener('pagehide', () => { leavingUploadPage = true; });
 		window.addEventListener('pageshow', event => {
diff --git a/components/upload-error.php b/components/upload-error.php
new file mode 100644
index 0000000..9724c6f
--- /dev/null
+++ b/components/upload-error.php
@@ -0,0 +1,59 @@
+<?php
+/** api#321: ошибка загрузки поверх страницы, без перестройки первого экрана. */
+$uploadErrorCopy = json_encode([
+    'title' => Yii::t('app', 'Ошибка связи'),
+    'network' => Yii::t('app', 'Не удалось загрузить изображение. Проверьте подключение к интернету и попробуйте ещё раз.'),
+    'other' => Yii::t('app', 'Не удалось загрузить изображение'),
+    'fallback' => Yii::t('app', 'Попробуйте ещё раз.'),
+], JSON_UNESCAPED_UNICODE | JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT);
+?>
+<style>
+.upload-error-popup{position:fixed;inset:0;z-index:10000;background:rgba(0,0,0,.65);display:flex;align-items:center;justify-content:center;padding:20px;box-sizing:border-box;overflow:auto}
+.upload-error-popup[hidden]{display:none!important}
+.upload-error-popup .upload-error-card{position:relative;width:100%;max-width:440px;padding:38px 32px 30px;text-align:center;border-radius:24px;border:1px solid rgba(255,255,255,.15);box-shadow:0 20px 80px #0008;background:#484848 linear-gradient(to bottom,rgba(61,135,227,.25),rgba(153,6,148,.25));color:#fff;box-sizing:border-box;font-family:Inter,sans-serif;max-height:100%;overflow:auto}
+.upload-error-popup .upload-error-card:focus{outline:none}
+.upload-error-popup h2{font-size:24px;line-height:1.3;font-weight:600;margin:0 0 16px;color:inherit}
+.upload-error-popup p{font-size:16px;line-height:24px;color:#e5e5e7;margin:0 0 24px;overflow-wrap:anywhere;white-space:pre-line}
+.upload-error-popup .upload-error-close{position:absolute;top:5px;right:5px;display:flex;align-items:center;justify-content:center;width:44px;height:44px;border:0;background:none;color:#e5e5e7;cursor:pointer;font-size:28px;line-height:1}
+.upload-error-popup .upload-error-ok{min-width:160px;height:48px;border-radius:16px;padding:0 28px;font:500 16px Inter,sans-serif;color:#fff;border:0;cursor:pointer;background:linear-gradient(180deg,#3d87e3 0%,#990694 100%)}
+.upload-error-popup button:focus-visible{outline:2px solid #fff;outline-offset:3px}
+@media(max-width:767.98px){.upload-error-popup .upload-error-card{padding:36px 24px 24px}.upload-error-popup h2{font-size:22px}.upload-error-popup p{font-size:15px;line-height:23px;margin-bottom:22px}.upload-error-popup .upload-error-ok{width:100%}}
+</style>
+<div class="upload-error-popup" id="upload-error-popup" hidden role="alertdialog" aria-modal="true" aria-labelledby="upload-error-title" aria-describedby="upload-error-text">
+ <div class="upload-error-card" tabindex="-1">
+  <button class="upload-error-close" type="button" aria-label="<?= htmlspecialchars(Yii::t('app', 'Закрыть'), ENT_QUOTES, 'UTF-8') ?>">×</button>
+  <h2 id="upload-error-title"></h2>
+  <p id="upload-error-text"></p>
+  <button class="upload-error-ok" type="button">OK</button>
+ </div>
+</div>
+<script>
+(() => {
+ const popup=document.getElementById('upload-error-popup');
+ if(!popup || window.ZoomzillaUploadError) return;
+ document.body.appendChild(popup);
+ const copy=<?= $uploadErrorCopy ?>, card=popup.querySelector('.upload-error-card');
+ const close=popup.querySelector('.upload-error-close'), ok=popup.querySelector('.upload-error-ok');
+ let previousOverflow='', previousFocus=null;
+ function hide(){
+  if(popup.hidden)return;
+  popup.hidden=true;document.body.style.overflow=previousOverflow;
+  const target=document.querySelector('#dropzone-form .dropzone-form-button') || previousFocus;
+  if(target && !target.disabled && target.isConnected)target.focus({preventScroll:true});
+ }
+ window.ZoomzillaUploadError={show(message,connection=false){
+  if(popup.hidden){previousOverflow=document.body.style.overflow;previousFocus=document.activeElement;}
+  popup.querySelector('h2').textContent=connection?copy.title:copy.other;
+  popup.querySelector('p').textContent=connection?copy.network:(message||copy.fallback);
+  popup.hidden=false;document.body.style.overflow='hidden';card.focus({preventScroll:true});
+ },hide};
+ close.addEventListener('click',hide);ok.addEventListener('click',hide);
+ popup.addEventListener('keydown',event=>{
+  if(event.key==='Escape'){event.preventDefault();hide();return;}
+  if(event.key==='Tab'){
+   event.preventDefault();
+   if(document.activeElement===close)ok.focus();else if(document.activeElement===ok)close.focus();else(event.shiftKey?ok:close).focus();
+  }
+ });
+})();
+</script>
diff --git a/components/upload-picker-style.php b/components/upload-picker-style.php
index 0bae544..db0c746 100644
--- a/components/upload-picker-style.php
+++ b/components/upload-picker-style.php
@@ -18,4 +18,8 @@ return <<<'CSS'
 #dropzone-form [data-files-picker]::after { content: ''; position: absolute; inset: 0 -8px -14px; }
 :is(#dropzone-form[data-mobile-upload], html[data-upload-device="mobile"] #dropzone-form, html[data-upload-device="android"] #dropzone-form) .dropzone-form-format-item[data-format-optional] { display: none; }
 html[data-upload-device=android] #dropzone-form [data-picker-or][hidden], html[data-upload-device=android] #dropzone-form [data-files-picker][hidden] { display: block !important; }
+/* api#320: однострочный заголовок; правило общее для API и Preland, включая Android picker. */
+@media(max-width:767.98px){
+ .index-mobile-fit #dropzone-form #form-title.index-upload-heading{font-size:clamp(16px,5.2vw,22px);font-weight:400;line-height:1.25;white-space:nowrap}
+}
 CSS;
diff --git a/tests/check-index-copy.php b/tests/check-index-copy.php
index 2b02475..4c797bd 100644
--- a/tests/check-index-copy.php
+++ b/tests/check-index-copy.php
@@ -8,7 +8,7 @@ ob_start();
 require dirname(__DIR__) . '/components/form.php';
 $html = ob_get_clean();
 $expected = [
-    '/id="form-title"[^>]*>(.*?)<\/div>/s' => 'Улучшить изображение',
+    '/id="form-title"[^>]*>(.*?)<\/div>/s' => 'ИИ улучшение изображений',
     '/data-upload-label>(.*?)<\/span>/s' => 'Выберите фото',
     '/data-files-picker hidden>(.*?)<\/a>/s' => 'Файлы (PDF и др.)',
 ];