To Create a Multi-Asset QuickLink, change your Page Size to be up to 200 assets by selecting the Options button within the folder.
Select the first asset and, while holding the "Shift" key, select the last asset in the folder to Highlight all the files. Once highlighted, select the Share icon over one of the assets' thumbnail.
If you have more assets to add to the QuickLink, simply drag and drop the additional assets over your QuickLink and Save.
NOTE: QuickSites linked to Folders update dynamically, but QuickLinks will need to be manually updated if files are uploaded or moved into the folder.