Hello,
I see you all creating these beautiful maps all the time, and am helping a not-for-profit with some field work research, and am looking for a product/solution similar to Google My Maps that can do the following:

1. Accept a CSV or KML of data locations and map them into a layer on a map
2. Allow a user to click on the visual representation of the data point and add an image attachment
3. Bonus points if I can control access to the map and share it out
   My problem with google my maps is that you are limited to 10 layers.

I've tried Mapbox studio but couldn't figure out a way to add images/attachments to the points. I then developed a custom application using Mapbox's api but have determined trying to mirror what google my maps does may be a longer process than I entailed.
Any advice/recommendations would be very appreciated!