I'm new in wagtail, I'm trying to customize the file upload event in admin side. How I can validate the file name (for image, document, or video) before to upload.
Wagtail customize file upload
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One way to this would be to build a custom document model where you can override the
__init__function and raise an exception if certain file extensions are used.http://docs.wagtail.io/en/v1.13/advanced_topics/documents/custom_document_model.html
This might be a bit heavy handed though without knowing what you are trying to do exactly.