According to the plan you subscribed to, you can save 30GB (plus plan), or 100GB (business plan) files to your cloud space.
On the cloud space page, you can preview files, check the details of the files, and delete files.
You can preview the video/image by clicking it.
Click the small icon at the lower right corner of the thumbnail, and you can check the details of this file.
Select one file, and you can click the Select All button at the bottom of this page to select all files.
Then, you can choose to move files to the trash or move them to a folder.
Click the Trash button on the top right corner, you can find all deleted files. Here, you can choose to restore files or delete them completely.