Find answers for your questions here.

I have attached a .gpx file, but I can’t see the track on map?

Be sure to select the .gpx file in the 'Gpx file' dropdown next to 'Sport' for each activity. Note that .gpx files that match the name of the .hrm / .xml file is automatically selected.

How can i upload my training files from polar flow with my v800?

As stated under Data transfer at Polar's own site: http://www.polar.com/en/products/maximize_performance/running_multisport/V800, export of files will come in september.

My map file is not accepted?

Only map files ending with .gpx is accepted, if you have a file with a .gpx.xml ending, just remove .xml and try again.

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