I know how to make .gifs but they have no sounds. I also know how to make .webs which do have sound.
Is it possible to attach a .webm on a post?
It's not possible network-wide. Only images and .gif
animations can be uploaded in Stack Exchange Q&A posts.
Speaking of externally hosted multimedia content, included via embed, this is only possible for YouTube videos on four specific stack exchange sites. Blender.StackExchange seems not to be interested in that feature anyway: see this post.
As I said it somewhere before on meta I will say it again now.
We need .webm support! Without sound.
For the sake of:
This example has around: .gif ~835kB, .apng ~740kB and .webm ~185kB
.webm is around 80% smaller than .gif in this example.
It's something. Right? Considering over bloated internet this is a big thing.
As much as I personally prefer fully written answer, it is undeniable that there are things that you cannot describe, there are ones that are just clearer with animated proof. We have them, we need them, we will still use them. So why not use nicer, smoother and considerably smaller way?
Nope. We have no video support.
Further I would caution you on how you use a video. Sure you can make a video put it on youtube and link to it. But that whole video should be supplemental to the written answer. If a video helps explain things (and sometimes it does) then in no way am I saying that you should not have a video, just that the video should not be your answer.
And that is why we do not have any kind of video embed support.
Note that this site also supports animated png files:
However, I might be wrong but the support of apng also depends on the browser.
If you ever want to upload videos, but they are in different formats beside gif, you can go to site Ezgif and convert your mp4 videos to gif. https://ezgif.com
If you have ffmpeg videos, go to this site below.
https://www.online-convert.com
Choose "Video convertor" and select "Convert to MP4." Upload video and hit "Start converson" button. Don't bother with settings below that.
Once you have created MP4 copy, go to Ezgif and convert it to gif.
At Ezgif, you can crop videos, optionally.