[Mobile][IOS] The “Do you want to download <file_name> ” pop-up is not shown after the download is complete for files larger than 50 MB

[Affected versions]:

• Safari for IOS 13.5.1
• Safari for IOS 12.4.6
• Firefox for IOS 27.0 (18428)

[Affected Platforms]:

• IOS 13.5.1 (iPhone 7+, iPhone Xr)
• IOS 12.4.6 (iPhone 5s)

[Prerequisites]:

• Have the “https://send2.dev.lcip.org/” page opened.
• Be logged with a valid Firefox account.
• Have uploaded files larger than 50 MB.

[Steps to reproduce]:

1. Tap the “Select files to upload” button.
2. Tap the “Download” button from the uploaded file.
3. Observe what happens after the download is complete.

[Expected result]:

• The “Do you want to download <file_name> ” pop-up with “View” and “Download” options is displayed.

[Actual result]:

• The pop-up is not displayed and the file is not saved anywhere.

[Notes]:

• The Safari browser crashed after downloading a 20 MB file on IOS 12.4.6 (iPhone 5s).
• The issue is not reproducible on Desktop using Safari browser 13.1.2.
• The issue is not reproducible on Android 7 using the Native browser.
• The pop-up is displayed when downloading smaller files.
• Attached is the screen recording with the issue: https://drive.google.com/file/d/1dEitZM6kcKV-Famah6Al_518SSj-LnEw/view?usp=sharing