If you are using the Loom screenrecorder option in Cloud Poodll for Atto, then you will need to set up a template to display your videos once recorded. 


Because the Atto edito by default will strip iframe tags when it saves the content, and Loom is inserted with iFrame tags. 

After you have recorded, a tag like the following will be added to your HTML area:


The Poodll filter will turn that into a nice responsive Loom player if it has a Loom template:

So you will need to install the Poodll filter and set up the Loom template by choosing "Loom" from the presets menu of an empty template's settings page.