Do I untick screen reader text and alt text box when displaying decorative images only?

I've read the guide it says to right click another place it says double click neither works in dominknow. At the bottom of the screen I see Accessibility tab with Alt Text and a fill in but can't find a way to made the grayed out Edit Asset button work.

I have a Audio Narration and i have timed the text/elements to the audio, Now i want to play the audio and animation when the user click on the button which is on screen? 

I have text which appears on screen by typing. Is there anyway to get the images to appear after this animation is completed. I cannot see any options to do this in Triggers or Actions without having to time it myself.   

I'm using the Story template in Flow and I know the nav menu in this template is not accessible. Screen readers will read each menu item on every new page. Just wondering if there is a way to make a screen reader ignore the nav menu entirely either with CSS or editing the published file. Thanks!

Hi, I'm trying to change the background colour of an input text box when the string that they input equals a pre-defined value (i.e. I'd like to have the input text box turn green when they enter the correct string). I can get the two parts of this problem working independently (colour change and string check trigger) but can't get them to work together. I've been able to successfully target and change the input text box background using the theme Add CSS functionality, and i can successfully...

Hi All,    Im creating a course for some, lets say, unruly teenagers and want them to be able to enter a username using a Text Input element.      Is there a way of making sure its only appropriate language used? 

I have a video in my Flow course that has an uploaded .vtt file for closed captioning. It works great on a desktop, but there's no cc text option on a phone....just the transcript. Is there a setting to allow the cc text on a phone?  Thanks