Closing this one as a duplicate of [mention:bbcffe83feae48398173cfe8b6d2d8e2:fb5d84b10a5745448a7a45dafc1faa43]
We want to enable opening multiple files at once in Online Editor, which then will also enable Autopropagation.
In the meantime this is possible with Trados Studio even with Cloud projects already today, so this is the recommended flow for these cases until we deliver it in OE.