I find it VERY frustrating that I am not able to upload data (ie. TrainerRoad, Zwift files) to my connect.garmin account using my iPad Pro or iPhone despite that fact that the functionality appears to be present. I am able to select import data and browse & select file but the Import Data button doesn't seem to work unless i use my Mac computer. This shouldn't be that difficult. Please fix.
It's a functionality that is not present in the mobile versions of Garmin Connect and never has been. They are for interfacing with an appropriate device over a bluetooth connection.
You should be able to upload data using your browser and Garmin Connect on the interweb but you will need to have the appropriate file saved to somewhere like Dropbox or iCloud where you can select it form Garmin Connect on the interweb.