Replace run I did with someone else I was with that recorded it.

[tr3sleches]

I accidentally split my run in two halves and I would like to replace my two runs with the run of someone I was running with (who recorded the whole thing in one fell swoop). Is that possible?

[ActivityFix]

In addition to what @Jan_Mantau suggested, you could also have your friend select "Add Others" from their activity and add you

[Jan_Mantau · Accepted solution]

If you can export the two halves in the correct file format you could recombine them with https://www.fitfiletools.com/#/combiner#view

Another option is asking your friend for his activity file and upload that as your own activity.