This meta-posting is intended to serve as a combination query + feature-request. I do not have a mobile device; I think that this posting needs input from users who do have a mobile device (e.g. smart phone). Following that, I think that this posting may then need moderator attention.
On a recent mathSE query, I questioned someone else's comment re that mathSE answer-previews are unavailable on mobile devices... At the link below, see my (user2661923) 2nd comment (near the end of the posting) followed by Alexey Burdin's response.
Using a desktop pc, my test of the following link seemed successful:
First of all, I am generally curious whether mobile-device-mathSE-responders are unable to pre-view their answers.
Assuming that this is a problem, do mobile-device-mathSE-responders consider the http://bandicoot.maths.adelaide.edu.au/MathJax/test/sample-dynamic-2.html link as an adequate substitute for pre-viewing their answer (if they want)?
If so, then I request that a FAQ question/answer be created to address this point.
If not, but if any mobile-device-mathSE-responders can suggest a different link, then (again) I request that the appropriate FAQ question/answer be created.
Alternatively, if this is (still) a problem for mobile-device-mathSE-responders, I don't think that it is a good idea for mathSE to try to incorporate "smart code" that will make the webpage "smart enough" to render a preview for a mobile-device-mathSE-responder. I think there are simply too many variables re operating systems, browsers, hardware, and changing conditions.
A possible alternative is for mathSE to provide a "practice page" where any user (mobile-device or desktop) can format and save an answer, and then review/edit their answer. Once they are satisfied, they could then lift their response back to the original posting that they want to respond to.
I think that the practice mathSE webpage would have to be user specific. I also think that it would be reasonable to "automatically delete" (et al) the practice webpage 12 hours (or 24 hours) from the last save. This is the point where I think that my posting (which may have evolved into a feature request) needs moderator intervention. I have no idea how feasible such an idea is. Nor do I have any idea whether it would be a waste of time (i.e. if almost no one used the feature). Obviously, if something like this is implemented at mathSE, then (again) I think that a corresponding FAQ entry should also be created.