The following tutorial outlines how the trash feature works.
Trash works as a recycle bin where you can remove the deleted files completely or can restore the deleted file to its original location. You can keep your trash files as long as you wish.
Deleting Binders and Files
Steps
As you delete Binder or File, they will be sent to Trash. You can view these Binders/Files in Admin --> Trash
You would get the above window as you go to Trash.
You can delete Binders from Manage Binder and Delete Files from Manage Files. Deleted Binders and Files will be directed to Trash. You can restore the deleted Binders/Files to their original location.
A file will be restored to its original Binder even if the original Binders is in Trash. In that case, the restored file would not be accessible until the original Binder is also restored from the Trash
Once you delete the Binder/File from the Trash, you will lose it permanently from AstrixDOC.