To accomplish this task, you will first need to know/find the file which you have uploaded to Egnyte. If the number is too big, then have an admin user run a file audit report (audit reporting should be enabled in your plan) on your domain for a specific time period and provide it to you.
Next step is to ensure that you as a user have full rights to delete those files. Once you have the filenames and their folder path along with the required permissions, deleting the files should be a piece of cake. Select the file, click on the delete option in the menu that show up and confirm the deletion.
I hope this helps. Feel free to write back if you need more assistance on this.
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