How to download an FMPro file without having a numerical suffix added to the filename?

You likely won't be able to prevent this. Exporting the same file is going to append a number to the end of the file. I tried clearing the Dropbox cache and even deleting the existing files from the external app, and the file was still saved with the next incremental number (i.e. saved 5 files, 1-5, deleted them all, saved another and it was 6).

If I had to guess, this is an Apple thing. It only happens when I export a file directly to an app's storage. If I use the Save to Files option and select On My iPhone for the location, it will prompt me to replace or keep both files.

I don't know how to "check the location (I've) exported it to" on the device.  That location is within the file system of Filemaker Go. But if I use iMazing on my desktop computer and look at the files on my device in Filemaker Go, yes, the duplicate files with increasing suffixes do show up.

Hey Custom Support, if you export the file to your device, -but without navigating to Filemaker Go- and then check the location you've exported it to, do you see the same file name as the one you see in Dropbox? 

Yes to Dropbox iOS App.

My FM files exist as separate files in Dropbox if that's what you're asking.

I have tried Dropbox App > Home > Recents (file) > ... > Save to Device > Favorites Bar > Click on Filemaker Go     Always adds suffix

I have tried Dropbox App > Files (file) > ... > Save to Device > Click on Filemaker Go in Favorites Bar     Inconsistent; OCCASIONALLY overwites

I have tried Dropbox App > Files (file) > ... > Save to Device > Save to Files    (I cannot find a way to make Filemaker Go show up there)

Hi Custom Support, thanks for posting to our Community!

Would you like to share some more insights in regards to the steps you follow on your end when downloading the files?

Do you then separately add them to your Dropbox account?

Also, is it safe to assume that you're using our mobile app since you've mentioned iOS? 

Keep me posted!