... the code should not have newline (no! carriage return); 
... the code must be all in one line ...

.

did not help

Hello,

If you copy and paste the code, try to select the HTML code and click on the icon to active it. See my example :

1) Enable html code [</>] as indicated by Jiper 85.
2) Your code can not work.
3) paste this code:
<iframe width="560" height="315" src="https://www.youtube.com/embed/6gt3o9hClL4?rel=0" frameborder="0" allowfullscreen></iframe>
>>> see

ciao

.

I just want to add a video gallery to the table.

www.unitegallery .net/index.php?page=video-icon

please help me

Hello Aliaksandr K.,

The taxt or table object is not meant to handle complex html codes but simple html tags.

I would suggest to use the video object and then with the cell style options you can set a border around it to make it appear like in a table. You can then use the same settings in the cell style in the objects near to make it seems like a table.

Many thanks!