Adjust watermark permissions and transparency

app/Filament/SuperAdmin/Pages/WatermarkSettingsPage.php

@@ -27,7 +27,7 @@ class WatermarkSettingsPage extends Page
         return __('admin.nav.branding');
     }
 
-    public ?string $asset = null;
+    public $asset = [];
 
     public string $position = 'bottom-right';
 
@@ -46,7 +46,7 @@ class WatermarkSettingsPage extends Page
         $settings = WatermarkSetting::query()->first();
 
         if ($settings) {
-            $this->asset = $settings->asset;
+            $this->asset = $settings->asset ? [$settings->asset] : [];
             $this->position = $settings->position;
             $this->opacity = (float) $settings->opacity;
             $this->scale = (float) $settings->scale;
@@ -119,8 +119,14 @@ class WatermarkSettingsPage extends Page
     {
         $this->validate();
 
+        $state = $this->form->getState();
+        $asset = $state['asset'] ?? $this->asset;
+        if (is_array($asset)) {
+            $asset = $asset[0] ?? null;
+        }
+
         $settings = WatermarkSetting::query()->firstOrNew([]);
-        $settings->asset = $this->asset;
+        $settings->asset = $asset;
         $settings->position = $this->position;
         $settings->opacity = $this->opacity;
         $settings->scale = $this->scale;