Picker should have a handler to process files before uploading

[rayanmestiri]

We can't process files before uploading them when using the picker, resulting in the user uploading file formats we don't support, etc.

[rnine]

@rayanmestiri Trying to understand your use case. Would restricting what document types can be selected and picked not be enough in your case?

[stanka-n]

I have the same issue. I can't convert .heic file to jpg before uploading the image.