If you have folder-level security (granular folder permissions) enabled in Settings > Misc > General, changes in functionality will significantly impact the way existing share behavior works when you upgrade to FileCloud 23.x and higher.
You need a license key to create new tickets in support; this article explains where you can get this information.
We are actively working with Microsoft on an issue impacting some users with viewing and editing Microsoft Office Documents (PowerPoint, Excel, Word, OneNote) via FileCloud over a web browser.