there is a difference between L4C Free and Pro:
- If you use the free version, the function 'Open in' is missing in the free version. It´s one of the short list on differences between the pro and free version.
- If you use the pro version, there is a bug on 'Open in' with gpx files directly. Zip files will work on each device, gpx files will work not on all devices. This bug I already fixed on the dev version and will be published with 1.2.1.
That means that in the pro version for pocket queries you should use the 'Compress a zip file' option on the end of the site. Using the 'Download gpx file' directly in the cache listing I would not advice (also when my bug is fixed), because gpx files does not contain waypoints without coords and there are no informations about images attached to the cache within the gpx file. In the case downloading only one cache I would advice to use the search function in L4C using the 'Cache Code' tab.
If you are using the pro version and you try to open a zip-compressed-gpx-file, but this does not work, please contact again to find the bug.