And is that Epson Print app something you use? Is it a third party app? Are you trying to open in Excel app? If it was me, I'd try installing Google Sheets, just to force the phone to ask me what app to open the file with, then select a preferred one.
Yes, I use the Epson App to print files, but not sure how it got linked to my Excel files. Before this happened, I would just click on a file and it would open for me to view. I never went into an app to open a file (unless trying to print-I would open the Epson app, then select a file to print). I ran a search on my phone for Excel but nothing appeared, so I just figured somehow the phone knows what to use to opens different files when I click on them.