[Mobile][IOS] The "Only 64 files can be uploaded at a time." pop-up is not displayed after trying to upload more than 64 files using the Safari browser

[Affected versions]:

• Safari for IOS 13.5.1

[Affected Platforms]:

• IOS 13.5.1 (iPhone 7+)

[Prerequisites]:

• Have the “https://send2.dev.lcip.org/” page opened.
• Be logged with a valid Firefox account.

[Steps to reproduce]:

1. Tap the “Select files to upload” button.
2. Select more than 65 files.
3. Tap the “Done” button from the top-right corner.
4. Observe what happens.

[Expected result]:

• The "Only 64 files can be uploaded at a time." pop-up is displayed.

[Actual result]:

• The Firefox Send homepage is displayed.

[Notes]:

• 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.