This explains how filenames work in the app — how they're used, and how to rename them.
The original filename is used when a file is uploaded directly to the Mediabank or a channel tree in the CMS. You can check it in File Details in the Mediabank.
Across all channels — via the description field in the Mediabank:
Result: in the CMS the new name is used when adding the file to a content box (and updates automatically if already added). In the app and share window, the new name shows. When downloaded via Webapp or share, the original filename is used.
Only in one content box or presentation:
If a file is replaced in the Mediabank via Change File: if not yet used in any channel, the new filename is used when added; if already used in a content box, the previous filename is kept there (no auto-overwrite) — rename it manually as above.