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merge multisport with single activity

Hi, I've completed a triathlon using the multisport mode on my FR 255S.

It was my first one, all went well but on the run I've accidentally pressed twice after the transition, which made the run last like 3 seconds. I've then started recording a new run.

I have now 2 activities: multisport and run, I would like to merge them, "extending" the multisport to include the last run leg. 

I've tried simply merging the two FIT files using https://www.fitfiletools.com/ but when I re-upload on Garmin connect I get a generic error.

I know I can edit the multisport and manually input the run data, but it wouldn't show the GPS data.

It's not the end of the world, but out of curiosity, it seems like you can't just merge a multisport with a single activity?

Any help much appreciated.

Thanks