Adobe applications - Case-sensitive volumes not supported Mojave
When you Erase a drive, or Add a volume to a Container, you will be given a choice of Format. By default, this is APFS, but it can be changed to "APFS Case Sensitive", which is presumable what you have already done.

You need to change the format to "APFS". Adobe applications have several 'issues' with case-sensitive volumes (even on HFS+) through errors of their own making.