Cannot use excel files offline when saved for offline use

I too cannot open offline Word or Excel files without Internet connection from the Dropbox Android app... i can only open pdf or jpg or other image files... I have found a workaround for Word and Excel documents, but want to be clear that there is definitely a flaw or bug in the Dropbox Android app and this needs to be elevated to your design team... When I'm disconnected from internet, I can open offline Dropbox Word and Excel files ONLY from within the Word or Excel apps, not from the Dropbox app. I did this by seeing the file I wanted in the Word or Excel "recent files" list and clicking on it. In order to make this work, I'm going to have to pin every single Word or Excel file l want to open offline in the Word/Excel menu, because I cannot find where Dropbox stores offline files on my phone. 

Dropbox needs to fix this:
1. Allow offline Word/Excel files to open via the Dropbox app without Internet connection 
2. In the meantime At least let users know where Dropbox offline files are stored so that we can open them without Internet using a file explorer app.