I have 2 years of exported history from training center in the correct format. manual import into Connect says the file is to large. I am not importing hundreds of smaller files. Help
Create the relevant dropbox directory, add the files to that directory and sync that to GC, failing that upload the files to another one of the apps that tapiriik supports and sync....
several years ago, I had the same challenge. I got one *.gpx File for every workout and I also didn´t want to upload them separately.
With the "GPX Editor" I was able to Drag & Drop all files into the application and store it as a single file. In my case it wasn´t to big (Connect - Classic Version).
Maybe you can reverse my approach. Open your single file with the editor and make 2-3 seperate files from it. Hopefully they are small enough then.