I’ve been using Yoink for ages on Mac/iOS, mostly on Mac. Great app.
But today I saw this review for Dropover, which does more for $3.99
It looks very interesting! Unlike Yoink you can create multiple shelves, you can use a shelf to upload to iCloud/OneDrive/GoogleDrive/DropBox/Imgur and get a share-link, and it comes with a macOS share extension.
It doesn’t have a shareable shelf with iOS (yet?) but the Mac app is half the price of Yoink on the Mac, and it does more.