When Profile-Based Chatter Rollout Feature is enabled for an organization and chatter is not enabled for a particular user profile, users with that profile will not be able to see the 'upload files' button under note and attachment section in an Experience Cloud Site.
1) Log in as a Salesforce administrator.
2) From Setup, enter Profiles in the Quick Find box, then select Profiles.
3) For each of your existing custom user profiles:
a) Click Edit.
b) Select Enable Chatter.
4) Save your changes.
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