Does the input tag not support uploading flv files? _html/css_WEB-ITnose

For example:

I use input to upload video files in flv format, but the filtering results are not displayed in chrome and cheetah browsers

<input id="btn_1" class="selectbtn" type="file"  accept="video/x-flv" /><!--第一种MIME-Type--><br /><input id="btn_2" class="selectbtn" type="file" accept="flv-application/octet-stream" /><!--第二种MIME-Type--><br /><input id="btn_3" class="selectbtn" type="file" accept="video/avi" /><!--用于测试MIME-Type-->

Three types Screenshots of the situation
1.

2.

3.


The first and second situations cannot be filtered like the third situation, how to solve it

Reply to the discussion (solution)

Can anyone help?

I can’t find anything related online Is there a solution to the problem that no one has encountered before?

It turns out it’s just that simple, I thought too much

But why can it be used on IE when I write it like that?

But why did I write it like that? Is it usable?
I don’t really understand either