Summary

Similar to CONFCLOUD-61672, when trying to upload larger attachments (tested with 50MB or more) through the attachments option for each page, the following message will be displayed:
"Your request could not be processed because a required security token was not present in the request. You may need to re-submit the form to reload the page"

Steps to Reproduce

1. In Confluence, go to any page and tap the ellipsis button (...) > Attachments
2. There, make sure to upload a 200MB+ attachments

Expected Results

After a while, the attachment should be properly uploaded.

Actual Results

The attachment is not uploaded and the user will be prompted with the message:

Notes

It happens intermittently, but, more for negative results (not being able to upload the same).

Workaround

Use the option to upload files from the edit mode of the page:

1. Tap the edit button
2. On the editor's menu, tap the '+/insert' button > Files and Images
3. Upload the attachment

Drag and drop the file into the page while published also helps, as it will use a different method to do the upload.