No need to change any file permissions. Leave them at the default of 755 for all wp-content folders.
Try doing this:
Login to your wp-admin at https://(yoursite.com)/wp-admin
go to settings – > media
ensure that the media upload path is set to the default of:
wp-content/uploads
If there is no option to change the media upload path, then it is already at the default, and this fix will not help you.