Hello @SarahWatson and welcome to the community
Copy / Paste URI normally but before click Post make this change :
Format URI you see in the box :
Replace it by this one
spotify:user:your spotify username:playlist:URI
Now click POST
Let me know if that worked :)
Thanks so much, that worked!
Hi there, I am having the same issue. Are you able to post a format here so I can do it on my own?