Could you please confirm if the photo you are uploading meets the following minimum requirements:
You can use the photo examples in this blog post as a reference. Alternatively, you can share the profile photo you are trying to add on your next reply so that I can look into this further.
In addition to the instructions, Avery shared in her post. Could you also try clearing your cache and cookies or logging in with another browser to upload your photo?
If you`re still unable to upload your image after this, let me know here and our team will assist you further. Thank you.