you’re loading relatively large image files. iNat resizes photos to no bigger than 2048px on the longest edge. the photo in your latest observation appears to have been loaded as something like 8000px on the longest edge. so that’s potentially loading a file that’s 16x bigger than it needs to be.
you can export smaller versions of the photos (or batch resize them), and the upload the smaller photos, and that should save you a lot of bandwidth and time uploading on a limited connection.
see this thread for a little bit of discussion on this topic: https://forum.inaturalist.org/t/image-upload-size-limit-warning-should-be-dropped-as-images-are-automatically-resized-anyway/39645.