Tinnishill wrote: I have just done a test. I used cycle.travel to create and download two GPX’s, Cockermouth to Keswick and then Keswick to Penrith. I dragged and dropped the GPX’s onto GPSPrune, which I already had on my computer. Using the “edit” feature I moved the contiguous ends of the tracks until they met. From the drop down menu it was “Range, select all > merge” and “Export GPX” naming the new GPX. I have now loaded the new GPX onto my Android phone to test on Osmand and seems to work fine.
Can you check if there is only one <trk> tag in the file, please? Searching with a text editor should suffice.
I had a play with Viking, doing similar, and while I can cut/paste tracks into one layer and then right-click the layer and Export as GPX to put them in one file, the two tracks remained in their own two <trk> sections. To actually merge them in one <trk>, I had to right-click the track and then pick Combine.