Errors with activity upload from Strava GPX/FIT files

Hi,

I downloaded an archive of my Strava data and trying to upload the activities into Intervals.icu but am getting multiple errors.

If I try and drag and drop the entire zip folder for activities i get this error;
image

If I try and upload an individual GPX file i get this error;

If I try and upload an individual FIT.GZ file I get this error;

What is going wrong here?

I also only want to upload data up until Nov 22, 2018 (I have activity data already in Intervals.icu from my Suunto sync since then)

Thank you for your help!

GPX files does not contain any of your workout data. It’s only the Workout Route/Track.

for those Fit.GZ files, can you try decompressing it first and see if there is valid data within those archives? And then try to upload those FIT files and see if there are errors?