Hi,
Please check what are the permissions set for these folders
wp-content
wp-content/plugins
If permissions are changed not correct then certainly it will not allow to add any new thing there.
Thanks
Permissions AND ownership!
Directories should be 755, files 644. Ownership should be the same for wp-content, wp-content/uploads, wp-content/plugins, etc.
Note that if you are re-installing *and the plugin’s directory already exists*, the installation will fail. You can work around this with this plugin: https://wordpress.org/plugins/baw-force-plugin-updates/ or you can delete the plugin’s directory via FTP or your hosting control panel’s file manager, then install as usual. The plugin’s settings, being in the database, will be retained.
Where and How do I check the permissions set for these folders? Through the FTP?
Yes, you can see them via FTP if you use an app like Filezilla, or contact your host for assistance.