We are migrating our existing application from SP 2016 on-premise to SharePoint online. The on-prem application is having lots of FAQ/Help files added as an html file and it will get loaded to another html page through iframe. When we migrated this to online, the html is not getting rendered instead its always downloading the file. we tried to replace the html with aspx, still we are facing issue with loading the file in IFrame. Could you please help to identify a suitable workaround for this html rendering issue.
Thank and Regards