Brandmeister suggested this and it's a good idea.
We encourage users to use useful filenames so they can be searched. This can be a pain in the butt or not possible on mobile devices. So now you can change the name on the fly.
Couple things to note, which are also on the upload form....

This will replace the file name from your device during uploading, it will not change the name on your device.

Must be at least 10 characters.

Use an easily searchable name.

Special characters and/or spaces will be stripped or replaced with dashes.

Please do NOT include the file extension. This will be taken from the file name on your device.

Filenames MUST be unique on the same day or it will overwrite the original.
Feel free to try it out in this topic if you like, but please only use small files.