Issue Summary

It is possible to restrict uploads by setting an Attachment maximum size under Confluence Administration > General Configuration.

When uploading an attachment larger than the maximum allowed size via the Attachments section of a page and using the Upload file button, a generic error message is displayed. The message is misleading to users and does not indicate the attachment size is larger than the current limit.

Steps to Reproduce

Steps:

1. Navigate to General Configuration - /wiki/admin/configuration
2. Set Attachment maximum size to 0 and Save
3. Navigate to any Page > Attachments > Files
4. Use the Upload file > Attach flow

Expected Results

An error message should be displayed informing the user the current attachment size limit.

Actual Results

A generic error is displayed:

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Screenshot:

Workaround

Using the Drag-and-Drop flow does display an informative error message, both from Edit mode and the Attachments menu:

<attachment> is too big to upload. Files must be less than 0 B.

Screenshot: