Unable to upload files in WordPress on Plesk server: The uploaded file could not be moved to wp-content/upload

To grant Modify/Write permissions website-wide to the domain user:

1. Log into Plesk.
2. Mark the option Additional write/modify permissions under Plesk > Domains > example.com > Hosting Settings.
   

To grant Modify/Write permissions only to the uploads folder:

1. Log into Plesk.

2. Go to Plesk > Domains > example.com > File Manager >wp-content ;

3. Click on the menu for the folder "upload" and select Change Permissions;

4. Select the Application pool group (IWPG_example) and add the Modify permission;

5. Click Ok.
   

Note: if direct RDP access to the server is not possible, contact server administrator for further assistance.

1. Connect to the server using RDP
2. Find the application pool user: IIS > servername > Application Pools > find user listed for example.com in Identity field:
   
   
3. Change permissions for C:\Inetpub\vhosts\example.com\httpdocs\wp-content\uploads folder so that application pool user for the site has modify permissions: