How do I import and export GPX files?

How do I import and export GPX files?
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[@north.bound_train]

when i have exported recorded rides in the past from the web site, the GPX file would include the timestamps.....i exported a ride just now and there are no timestamps, so i am getting errors when trying to use the gpx file because of this lack of timestamps. How can i export from Calimoto in such a way as to INCLUDE those timestamps from my recorded rides?

[@Takko93]

Same problem.