Cachly can import GPX files from a number of sources and supports importing of .gpx and .zip files.
Use the Dropbox app on your iOS device and find the file that you want to import. Tap the ... button next to the file and choose to Share and then Export file. Choose Cachly from the list of apps to share with.
You can also use the iOS Files app to browse your Dropbox files and share with Cachly:
Use the Google Drive app on your iOS device and find the file that you want to import. Tap the ... button next to the file and choose Open in. Choose Cachly from the list of apps to share the file with.
You can also use the iOS Files app to browse your Google Drive files and share with Cachly:
The GPX or .zip file will show as attachment. iOS might say "Tap to download". Once downloaded, long press on the file and choose the Share option. Choose the Cachly icon. Cachly will open the import screen where you can select an existing offline list or create a new one.
If a friend has some caches they want to send you, have them do an Export GPX from Cachly and Email the result to you. Then you can do as just described to load them into your Cachly.
Note: Sometimes a GPX file is compressed into a file with a .zip extension. You can treat this just like the above to import. Cachly will take care of unzipping the file.
Once you have downloaded a file from the cloud you can long press the file and choose the Share option. Next choose Cachly and the file will be sent to Cachly and will show the Import screen.
You can send a GPX or .zip to Cachly using Airdrop from another device or from macOS. This will bring up a list of apps on your device, choose Cachly and the Import screen will show.
iOS Share Option
If another app has a GPX and provides a Share option you can choose Cachly to send the file.