The Upload button is not visible and is unable to upload a file to the placeholder in Vault?
The reason as to why a user is unable to see the Upload button for a placeholder is because the user has to have Edit Document permission on the the placeholder's current state.
Vault Admin Documentation: Working with Content Placeholders
Send us your feedback: We are always looking for feedback to help improve our Knowledge Base! Please let us know if this article is helpful or provide feedback on how we can improve your experience by clicking here.