Hello Amy! Thanks for getting in touch and welcome to the forums. We’re stoked you made the move to PRO and thank you for your support. 🙂
It sounds like you might be uploading the plugin to your Media Library instead of the Plugins area. If you head over to Plugins > Add New from the WordPress dashboard, there should be a “Upload Plugin” button at the top of the screen. Click that and it will allow you to select, upload and install the plugin from there.
If you have any doubts here, you might want to check out this tutorial for more help.
Does this help? Please let me know and thanks again for reaching out!
Geoff