I believe it is in the database and it can be verified with JOSM by downloading GPS data from that area. I an guessing that Potlatch, when used through Edit, reads the data from the uploaded file and otherwise from the database and that makes the difference.
Potlatch only draws GPS traces with lines between them - it doesn’t do them as individual dots. This means that it has to know what order they’re in.
If you click ‘Edit’ next to the trace, that’s easy. It can just get the order by reading through the file, point by point.
But if you click the GPS icon (which reads from the database, not the raw uploaded file), it has to look at the timestamps to find what order they’re in. If your timestamps are all the same, it can’t do this, so can’t display the track.
This is a unique feature of Potlatch. However, the points are still valid for inclusion in the database, as the XML API (as used by JOSM and Merkaartor) doesn’t provide any ordering information at all - just the co-ordinates of the points. So if you upload a GPX with non-ascending timestamps, it can be used in JOSM and Merkaartor but not Potlatch.
‘Problem’ is I’m using only Potlatch, no offline editors, so I’m not able to check in an easy way whether the data are included in database or not. I do realize now that I’m not able to see other people traces when not timestamped correctly (no idea what’s the ’ default’)
So, when no (ascending) timestamps available, some ‘could have’ import-features could be:
the mail includes a warning message. The message is telling me about the consequences, and can give the advice to retract track and upload a new one?