In the end, you were of course correct. Locus placed instead of empty trackpoint, "straight" starting command during merging of segments. Issue fixed, thanks!
Creating of "via points" improved little bit.
Opening in "file browser" .. hmm I was worried this will happen. There is no general command that is common for all file browsers in Android. I'll try to play with it little bit, but expect that this option will be maybe removed in final version if I won't find working solution.