Fix bulk upload: store temp files on S3

.env.example

@@ -121,7 +121,9 @@ CERTIFICATE_ADMIN_EMAILS=
 FILESYSTEM_CLOUD=s3
 RESOURCES_BUCKET=
 RESOURCES_URL=
-BULK_UPLOAD_TEMP_DISK=local
+# Bulk event/user upload temp files — Amazon S3 so every web node/worker sees them.
+# Use local only for single-machine development without AWS.
+BULK_UPLOAD_TEMP_DISK=s3
 RESOURCES_IMPORT_TEMP_DISK=local
 
 # ---------------------------------------------------------------------------

app/Http/Controllers/BulkEventUploadController.php

@@ -9,6 +9,7 @@
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\RedirectResponse;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Log;
 use Illuminate\Support\Facades\Storage;
 use Illuminate\Support\Str;
 use Illuminate\View\View;
@@ -75,8 +76,12 @@ function ($attribute, $value, $fail) {
                 ->withInput();
         }
 
-        $tempDisk = config('filesystems.bulk_upload_temp_disk', 'local');
-        $path = $file->storeAs('temp', 'bulk_events_'.time().'.'.$extension, $tempDisk);
+        $tempDisk = $this->tempDisk();
+        $path = $file->storeAs(
+            'temp/bulk-events',
+            'bulk_events_'.time().'_'.Str::random(8).'.'.$extension,
+            ['disk' => $tempDisk, 'visibility' => 'private']
+        );
 
         $headerCheck = BulkEventUploadValidator::validateRequiredColumns($path, $tempDisk);
         if (isset($headerCheck['error'])) {
@@ -183,8 +188,14 @@ public function import(Request $request): RedirectResponse
         }
 
         $path = (string) ($payload['path'] ?? '');
-        $disk = (string) ($payload['disk'] ?? 'local');
+        $disk = (string) ($payload['disk'] ?? $this->tempDisk());
         if ($path === '' || ! Storage::disk($disk)->exists($path)) {
+            Log::warning('Bulk event import: temp file missing', [
+                'token' => $token,
+                'disk' => $disk,
+                'path' => $path,
+            ]);
+
             return redirect()->route('admin.bulk-upload.index')
                 ->withErrors(['import' => 'Uploaded file no longer available. Please upload again.']);
         }
@@ -226,4 +237,14 @@ public function report(Request $request, ?string $token = null): View|RedirectRe
         return redirect()->route('admin.bulk-upload.index')
             ->with('info', 'Report no longer available. Run an import to see a new report.');
     }
+
+    /**
+     * Shared temp disk (Amazon S3). `local` is not shared across web nodes.
+     */
+    private function tempDisk(): string
+    {
+        $disk = (string) config('filesystems.bulk_upload_temp_disk', 's3');
+
+        return $disk !== '' ? $disk : 's3';
+    }
 }

config/filesystems.php

@@ -5,9 +5,26 @@
     'cloud' => env('FILESYSTEM_CLOUD', 's3'),
 
     'resources_import_temp_disk' => env('RESOURCES_IMPORT_TEMP_DISK', 'local'),
-    'bulk_upload_temp_disk' => env('BULK_UPLOAD_TEMP_DISK', 'local'),
+
+    // Shared Amazon S3 (or FILESYSTEM_CLOUD). `local` breaks multi-server:
+    // validate stores on one node, import hits another → file missing.
+    'bulk_upload_temp_disk' => env('BULK_UPLOAD_TEMP_DISK', 's3'),
 
     'disks' => [
+        'local' => [
+            'driver' => 'local',
+            'root' => storage_path('app'),
+            'throw' => false,
+        ],
+
+        'public' => [
+            'driver' => 'local',
+            'root' => storage_path('app/public'),
+            'url' => env('APP_URL').'/storage',
+            'visibility' => 'public',
+            'throw' => false,
+        ],
+
         'latex' => [
             'driver' => 'local',
             'root'   => resource_path('latex'),