Multimedia macro will fail to play MP4 file if attachment has square brackets in its name.

Issue Summary

The multimedia macro will fail to play an MP4 file if the attachment has square brackets in its name.

Steps to Reproduce

1. Upload a small.mp4 and sma[ll].mp4 to a Confluence page.
2. Create a multimedia macro from it.
3. Publish/save page

Expected Results

Both files should be able to play.

Actual Results

Only small.mp4 is playable.

In a HAR file you will see error 400 for sma[ll].mp4 resource:

Workaround

Rename file in a way that does not have "[]" characters in its name.