You can trigger an installable build for these changes by visiting CircleCI here.

Writing flow sanity tests:

• ❌ Undo-redo (steps) Issue: [iOS] Redo history lost after adding link to text gutenberg-mobile#2091
  This is not a regression on this version (so probably not a blocker). Still happens on WPiOS v14.5.
• Copy-paste (steps)
• Splitting blocks (steps)
• Multiline components (steps)
• Formatting on rich-text based components (steps)
• Block insertion (steps)

Edit: Fixed on 56402cc 🎉

@SergioEstevao - I'm still seeing the wrong font on Preformatted block.
Did this PR make it to the release? WordPress/gutenberg#21255

Testing new features:

• ✅ Added the Cover block
• Improve icon on the "Take a Video" media option (Not on iOS)
• ✅ Removed the dimming effect on unselected blocks (Inner blocks)
• ✅ Add alignment options for Heading block
• ✅ Implemented dropdown toolbar for alignment toolbar in Heading, Paragraph, Image, MediaText blocks
• ✅ When editing link settings, tapping the keyboard return button now closes the settings panel as well as closing the keyboard.

Sanity tests for MediaText1-2-3-4, MultipleUpload-1, Shortcode-1 all behaving as expected. I did encounter a bug when I deviated slightly from the test path for uploading in airplane mode (image and video), which I've noted below.

Sanity tests (iOS):

MediaText-1

• Media Text block - Insert image from device (failing) - steps

👆 Following the exact steps works, however, I encountered a bug when I turned on airplane mode prior to tapping "Choose from device": the upload progress is stuck, and the failure message never appears.

Screenshot

• Media Text block - Close/Re-open post with an ongoing image upload - steps

MediaText-2

• Media Text block - Insert video from device (cancel) - steps
• Media Text block - Insert image from device (cancel) - steps

MediaText-3

• Media Text block - Insert video from device (failing) - steps

👆 Just as the similar test-case for image uploading works, this hangs with no failure message if the upload is started with airplane mode on.

• Media Text block - Close/Re-open post with an ongoing video upload - steps

MediaText-4

• Media Text block - Media & Text alignment - steps
• Media Text block - Vertical alignment - steps

MultipleUpload-1

• Simultaneous uploads - steps

Shortcode-1

• Shortcode block - Add a youtube link - steps

👆 Following the exact steps works, however, I encountered a bug when I turned on airplane mode prior to tapping "Choose from device": the upload progress is stuck, and the failure message never appears.

Thank you @mkevins ! I tried the same thing, looks like an intermittent issue, so not happening all the time. The good part is if you tap on the stuck upload it still shows the “Retry” option, only missing thing is the “Failed to insert media” indication on the image. I was able to see that label for a split second and then it gets lost. Could you open an issue and add to Mobile Gutenpages board?

IMO: Not a blocker for the release.

Could you open an issue and add to Mobile Gutenpages board?

Certainly! Just circling back to link the issue here for posterity: wordpress-mobile/gutenberg-mobile#2106