You can also arrange and delete files by size in Gmail on the desktop. Here's how:

 

1. Log into your Gmail account. 

2. Type has:attachment larger:10MB into the search bar and hit Search. This will show you all emails that have attachments larger than 10 MB from largest to smallest. You can use this format to filter by other size files, not just 10 MBs. 

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3. Check the boxes to the left of each email you want to delete, then click the Trash icon in the top-right corner of the screen.

4. Click Trash on the left side of the screen to go to the Trash menu. If you don't see Trash, click More and Trash should be in the expanded menu. 

5. Once in Trash, click Empty trash now at the top of the screen.

Here's how to arrange and delete files by size in the Gmail app:

1. Open your Gmail app and log into your account.

2. Type has:attachment larger:10MB into the search bar and hit Search. This will show you all emails that have attachments larger than 10MB, from largest to smallest. You can use this format to filter by other size files too, not just 10MBs. 

3. Tap into the email you want to delete.

4. Tap the trash bin icon in the top-right corner of your screen.

5. Tap < in the top-left corner of your screen.

6. Tap the hamburger icon in the top-left corner of the screen next to Search in mail. 

7. Tap Trash.

8. Tap Empty trash now.

Note that once a file goes to Trash, it will automatically delete after 30 days.