Agate
--- a/api/funkwhale_api/instance/dynamic_preferences_registry.py
+++ b/api/funkwhale_api/instance/dynamic_preferences_registry.py
    )
    widget = widgets.Textarea
    field_kwargs = {"required": False}
+
+
+class ImageWidget(widgets.ClearableFileInput):
+    pass
+
+
+class ImagePreference(types.FilePreference):
+    widget = ImageWidget
+    field_kwargs = {
+        "validators": [
+            FileExtensionValidator(allowed_extensions=["png", "jpg", "jpeg", "webp"])