Added part about serialization issues when using file-upload in non-API context #2160
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Added part about serialization when using a file upload with the User entity, which gets serialized by Symfony for the session.
Ignoring this will result in an PHP exception when trying to upload a file to the User entity via the Symfony form builder.
To be fair, this is not exactly an API platform issue, since the upload via API works flawlessly even without this change.
I just happened to face this issue in this context, and found several other public posts about people using API platform facing the same issue.
It's totally fine if you don't want to have that part in your documentation though!