Let me ask here. I'm looking to send .gpx of an area I choose. I have a file that has a multitude of tracks/routes and looking to share a portion of, as in a area. As of yet, I've failed doing it..
Suggestions of ways to try?
There are several ways you can do this. Download the tracks and waypoints you want to share, then email them to the people you want to share them with. They can then import the data into whatever app they use.
You can share a link to an online folder in Gaia GPS. You would want to copy the portions you want to share into a new folder and then share that folder link with people. At the top of the screen for the folder, track, etc you will see Share This. Tap the 3rd icon and it will give you a URL to share.
You can share folders with people from within the app. Again you would want to move the data you want to share into a dedicated folder. Go to that folder on your device, tap the share icon, and then enter the email addresses for the people you want to share the data with.