What is wrong with this PHP code?

Question

I was trying to put link inside variables and call it inside echo:

<?php
$link = 'https://jia666-my.sharepoint.com/:v:/g/personal/s1pxky0tu_xkx_me/EXvt95V1DmRHg9lrqhd5L0ABby8GhL5XC15qXq1tu87zYw?Download=1';
echo '<video controls="" height="640" width="720">
  <source src="<? $link ?>" type="video/mp4"></source>
  <source src="<? $link ?>" type="video/webm"></source>
  Your browser does not support the video tag.
</video>';
?>

I allso tried:

<?php
$link = 'https://jia666-my.sharepoint.com/:v:/g/personal/s1pxky0tu_xkx_me/EXvt95V1DmRHg9lrqhd5L0ABby8GhL5XC15qXq1tu87zYw?Download=1';
echo '<video controls="" height="640" width="720">
  <source src=". $link." type="video/mp4"></source>
  <source src=". $link." type="video/webm"></source>
  Your browser does not support the video tag.
</video>';
?>

But none of them play video while executing the code.

Answer 1

https://code.sololearn.com/wwGKKYmCSTl9/?ref=app