.. ok, so I tried with importing several courses - the Courses Import indeed accepts a single file only. However, the opening post was about activity files, not about courses. And I confirm that there…
As trux stated, importing multiple activity GPX files works. Just did 24 in one drop-and-drag. If you are indeed importing activities (not courses), I would have to question the source of the gpx files…
Are you speaking about importing GPX files as Courses (on the Courses page), or about GPX activities on the Import page? In the later case, I am indeed frequently importing multiple files without any issues. In contrary, I did not try yet, importing several courses in the same time.
.. ok, so I tried with importing several courses - the Courses Import indeed accepts a single file only. However, the opening post was about activity files, not about courses. And I confirm that there is no problem with importing multiple files there.