I have the same sort of issue, all I can open is their sample files nothing else.
I even emailed myself a edrawing file and the mail app says there isn't an app that can open that kind of file.
When I select the "user file" menu it gives me two options neither of which does anything.
I have to import a file to open it?
why not just let me open a file from a directory?
Kind of thing thats been around since windows 3.1
i found the solution to this earlier today
you need to download off the play store a new file manager, give it access to your downloads then if using email click save on the attachment, it will be saved in the downloads folder on the file manager, go to the file manager locate the file and click it and if you have EDrawings on your phone/tablet it will open it
you only need to do that once then it will be in your My Files folder in EDrawings