I am sure i already know the answer to this; but is it possible that an image upload widget that uses ajax would fail using this authentication technique?
I have a plupload field which allows users to drag/drop multiple images to an image field. This works fine when the user is properly authenticated; but i am seeing a 403 in response to trying to upload with authlink.
Postponed: needs info
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
The module only authorizes the node but not any other related entities. If that file upload requires to create an entity (a media entity, for example), Node Authlink can't authorize that so you may see the error. Is that your case?