If you use the Folio Migration Tool to migrate your content, then articles will work, but the shared assets that were in the HTMLResources file are included individually in each migrated article. At this time, the Portal does not have the UI in place to upload shared resources. That feature is on the roadmap. However, you can use APIs to upload shared assets. For details, see this article:
Thanks Christophe, but that's not the case. I'd like to use same assets from multiple articles having html overlays. In DPS it was done by packaging all assets into HTMLResources.zip, attaching this zip to folio, and referring to it with ../../../HTMLResouces/sharedAsset from html.
I know that i can pack all assets to all articles, but this increases project size dramaticaly. Having nearly 50 articles in publication that are using same html assets which size is ~ 2MB, publication size increases by 100MB.