Fixed adding an item picture at creation time

src/pretix/base/models/items.py

@@ -1,4 +1,5 @@
 import sys
+import uuid
 from datetime import datetime
 from decimal import Decimal
 
@@ -66,9 +67,9 @@ class ItemCategory(LoggedModel):
 
 
 def itempicture_upload_to(instance, filename: str) -> str:
-    return '%s/%s/item-%s.%s' % (
+    return '%s/%s/item-%s-%s.%s' % (
         instance.event.organizer.slug, instance.event.slug, instance.id,
-        filename.split('.')[-1]
+        str(uuid.uuid4()), filename.split('.')[-1]
     )
 
 

src/pretix/control/views/item.py

@@ -582,7 +582,12 @@ class ItemCreate(EventPermissionRequiredMixin, CreateView):
     def form_valid(self, form):
         messages.success(self.request, _('Your changes have been saved.'))
         ret = super().form_valid(form)
-        form.instance.log_action('pretix.event.item.added', user=self.request.user, data=dict(form.cleaned_data))
+        form.instance.log_action('pretix.event.item.added', user=self.request.user, data={
+            k: (form.cleaned_data.get(k).name
+                if isinstance(form.cleaned_data.get(k), File)
+                else form.cleaned_data.get(k))
+            for k in form.changed_data
+        })
         return ret
 
     def get_form_kwargs(self):