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When you edit a non-current revision and try to attach a file you get a validation error.
This is because of a bug in drupal 5 in the upload module.
I have made a patch for drupal 5 core that fixes this bug, which you can download at #647312: Validation error when uploading files to non-current revisions
Comments
Comment #1
jbrauer CreditAttribution: jbrauer commentedNot presently doing work on the 5.x branch. If a patch is completed will certainly look at committing it. Setting this to postponed so it's clear it won't happen any time soon if at all.
Comment #2
Agileware CreditAttribution: Agileware commentedThe patch is actually for core and is at the issue I referred to in the original post.
I'm just posting here because it affects users of this module so they might be interested.