I have to make playaable adverts to run on fb. I’ve tried to construct the venture with Facebook prompt or utilizing one other software however I get the warning that the supply comprises XMLhttprequest.
And the ensuing file can’t be previewed.

construct fb prompt cant be used as playble adverts. if you wish to construct playable adverts, you should use this:
https://retailer.cocos.com/app/en/element/3732

What if I construct with Web cell and zip the entire thing?

I’m within the measurement, the software you say will increase the scale of the construct file an excessive amount of. I attempted it. The playable .html file wants < 2MB , whereas the total useful resource zip file is < 5MB. Your approach doesn’t meet that requirement.

Your venture is just too large, think about optimizing the scale of the assets. You can use this to compress photos : https://tinypng.com/

I’ve packaged a venture with solely 226k.

How did you this? I simply packed second empty venture and I’ve 2.8m: