Apply the filetype filter to accept attribute of file input.

This way only files are shown which match the current attachment type and the user knows directly which file types are allowed or not.

src/Form/AttachmentFormType.php

@@ -70,6 +70,7 @@ class AttachmentFormType extends AbstractType
                 'label' =>  $this->trans->trans('attachment.edit.attachment_type'),
                 'class' => AttachmentType::class,
                 'disable_not_selectable' => true,
+                'attr' => ['class' => 'attachment_type_selector']
             ]);
 
         $builder->add('showInTable', CheckboxType::class, ['required' => false,

src/Form/Type/StructuralEntityType.php

@@ -23,6 +23,7 @@
 namespace App\Form\Type;
 
 
+use App\Entity\Attachments\AttachmentType;
 use App\Entity\Base\StructuralDBElement;
 use App\Entity\Parts\Storelocation;
 use App\Repository\StructuralDBElementRepository;
@@ -114,6 +115,11 @@ class StructuralEntityType extends AbstractType
         if ($this->options['disable_not_selectable'] && $choice->isNotSelectable()) {
             $tmp += ['disabled' => 'disabled'];
         }
+
+        if ($choice instanceof AttachmentType) {
+            $tmp += ['data-filetype_filter' => $choice->getFiletypeFilter()];
+        }
+
         return $tmp;
     }