--- a/app/Http/Controllers/AttachmentController.php
+++ b/app/Http/Controllers/AttachmentController.php
@@ -37,7 +37,7 @@ class AttachmentController extends Controller
     {
         $this->validate($request, [
             'uploaded_to' => 'required|integer|exists:pages,id',
-            'file' => 'required|file'
+            'file' => 'required'
         ]);
 
         $pageId = $request->get('uploaded_to');
@@ -66,7 +66,7 @@ class AttachmentController extends Controller
     {
         $this->validate($request, [
             'uploaded_to' => 'required|integer|exists:pages,id',
-            'file' => 'required|file'
+            'file' => 'required'
         ]);
 
         $pageId = $request->get('uploaded_to');

--- a/app/Http/Controllers/BookshelfController.php
+++ b/app/Http/Controllers/BookshelfController.php
@@ -146,7 +146,7 @@ class BookshelfController extends Controller
         $this->validate($request, [
             'name' => 'required|string|max:255',
             'description' => 'string|max:1000',
-            'image' => $this->imageRepo->getImageValidationRules(),
+            'image' => $this->getImageValidationRules(),
         ]);
 
 
--- a/app/Http/Controllers/Controller.php
+++ b/app/Http/Controllers/Controller.php
@@ -195,6 +195,6 @@ abstract class Controller extends BaseController
      */
     protected function getImageValidationRules(): string
     {
-        return 'image_extension|no_double_extension|mimes:jpeg,png,gif,bmp,webp,tiff';
+        return 'nullable|image_extension|no_double_extension';
     }
 }

--- a/app/Http/Controllers/SettingController.php
+++ b/app/Http/Controllers/SettingController.php
@@ -44,7 +44,7 @@ class SettingController extends Controller
         $this->preventAccessInDemoMode();
         $this->checkPermission('settings-manage');
         $this->validate($request, [
-            'app_logo' => $this->imageRepo->getImageValidationRules(),
+            'app_logo' => $this->getImageValidationRules(),
         ]);
 
         // Cycles through posted settings and update them
@@ -57,7 +57,7 @@ class SettingController extends Controller
         }
 
         // Update logo image if set
-        if ($request->has('app_logo')) {
+        if ($request->has('app_logo') && !$request->has('app_logo_reset') && !$request->has('setting-app-logo')) {
             $logoFile = $request->file('app_logo');
             $this->imageRepo->destroyByType('system');
             $image = $this->imageRepo->saveNew($logoFile, 'system', 0, null, 86);

--- a/app/Http/Controllers/UserController.php
+++ b/app/Http/Controllers/UserController.php
@@ -155,7 +155,7 @@ class UserController extends Controller
             'password'         => 'min:6|required_with:password_confirm',
             'password-confirm' => 'same:password|required_with:password',
             'setting'          => 'array',
-            'profile_image'    => $this->imageRepo->getImageValidationRules(),
+            'profile_image'    => $this->getImageValidationRules(),
         ]);
 
         $user = $this->userRepo->getById($id);
@@ -191,7 +191,7 @@ class UserController extends Controller
         }
 
         // Save profile image if in request
-        if ($request->has('profile_image')) {
+        if ($request->has('profile_image') && !$request->has('profile_image_reset')) {
             $imageUpload = $request->file('profile_image');
             $this->imageRepo->destroyImage($user->avatar);
             $image = $this->imageRepo->saveNew($imageUpload, 'user', $user->id);

--- a/app/Uploads/ImageRepo.php
+++ b/app/Uploads/ImageRepo.php
@@ -225,6 +225,6 @@ class ImageRepo
      */
     public function getImageValidationRules(): string
     {
-        return 'image_extension|no_double_extension|mimes:jpeg,png,gif,bmp,webp,tiff';
+        return 'image_extension|no_double_extension';
     }
 }