i tried to run medium editor in bootstrap modal. there are medium editor buttons but there is no change my text when clicked editor's buttons.

Please provide a link to your page, where we can check what is wrong.

you can check this link Teodor..

netglobalturkey.com/dmx1/test.html

Hello Serhat,
Please remove tabindex="-1" from the modal opening tag - this will solve your issue.

Hello Teodor ,
It works when remove tabindex="-1" but It doesnt work on mobile phone ...
you can try it open link with your mobile phone ...

What exactly is not working on your phone? Everything looks just fine on mine.

click open modal button then write something in textarea field then chose all words and then medium editor not work .. I can see only cut / paste etc..

But that is nothing related to medium editor ... this is all caused by your mobile OS. There is nothing we can do about this nor this is related to the modal.

I actually just encountered quite similar problem. I guess Medium Editor just doesn't work well, and should not be used inside modal.