As above, it seems strange that you can open files in Proton Docs, but a new file is created (pdoc) instead of amending the original file. Google drive allows for editing of docx and excel files from the drive without creating a separate doc. Clearly outline in your documentation that a new file is created to avoid confusion. This would also help in the future with integration of proton drive clients and seamless integration with file managers like on windows. I can amend files on pdrive on my windows machine but i cannot do so on my phone or using the drive online.