Indeed, I tried inserting rows/columns from Libreoffice Calc which are regarded as a table, while display worked on my end, there was difficulty editing the table and deleting it, hopefully it displayed correctly on the other end.

HTML support is critical when I'm sending emails in a professional setting for me. The fact the Android app only supports plain text makes the app useless for me outside of simple personal emails. I'm currently stuck writing most of my emails on the mobile browser. Why such a basic standard feature in modern email apps hasn't been implemented in the Proton Mail Android app is beyond me.

Support HTML in Android app. Currently it only supports plain text. The previous app also supported HTML, which is essential in an email app

Would be very nice to be able to customize the html

Definitely need some improvements in the way HTML emails are rendered on mobile. Things currently look like they are zoomed out desktop emails, which makes email hard to read.

Duplicate of this...

"Ability to compose emails in html"
https://protonmail.uservoice.com/forums/284483-feedback/suggestions/7357054-ability-to-compose-emails-in-html

Great feature! +3

This would be really useful. I gave it three votes.

Yeah, it is important to be able to compose emails in html (creating headers, etc.)

This would make it more likely for me to stay with ProtonMail over switching to another service. I'd love to be able to compose emails in html.

Currently I get around this by composing html emails in a different app and the copy/pasting the result over, but that is inefficient.

I agree. This is an extremely important feature for a modern email program.

I would like to see the ability to insert HTML code for the sending of HTML email, much like Thunderbird's Insert > HTML function. Also, I'd like to see ProtonMail robustly render CSS styles and media queries for HTML email.

Definitely, also a URL button should be added as well!