My Abstracts Option Missing and Add Submission Button Not Visible for Users

Why can't users see the 'My Abstracts' option in the dropdown and why is the green 'Add Submission' button missing in 'My Submissions'? How can this be resolved?

This issue typically occurs when the submission access is restricted to a specific group, such as 'late breaking authors only'. See this screenshot: https://cln.sh/vZJX7HPF

To resolve this, an admin needs to go to the Submission settings under Abstracts & Reviews > Basic Setup and uncheck any restrictions limiting submissions to certain author types. 

After saving these changes, all authors should be able to see the 'My Abstracts' option and have the 'Add Submission' button available, allowing them to submit abstracts normally.