Jeremy
That explains the mysterious omission of such a feature. A key use case for me is when I have a folder of images and PDF's I want to display in a tiddlywiki yet I want to avoid loading the tiddly wiki up and making it too big. If I could choose a specific library ..\images Place my files in that and drag and drop to the tiddly wiki it would save a lot of time. Perhaps I do need to provide the relative or absolute path ..\image at the time of the drag and drop (For all that I am about to "import") to use in the creation of the tiddlers, perhaps also an optional check box specifying that I want external links (not importing) on the Import tiddler would make this a low impact change.
Clearly Drag and Drop does have access to the filename of each item dragged and dropped, all we need to do is parse this list as external files/links with the manual provision of the source path.
Another thought is the import feature, permitting import of external links to selected files, and allow a multi-select, I would have thought the browser has to know the full path to do this import?, but I expect I may be wrong on that.
Background (optional reading)
For example I am building an edition of TW5 that I call USD's, Universal Storage Device, A bit like "USB".
On a low cost USB drive I have a tiddlywiki that acts as the WebSite for the USB Drive, I can access this using a OTG Host cable from my smart phone, or tablet. also by placing the USB in a USB port of a computer or on a WiFi access Point. I have a few of these already, One in my car has all the car manuals and service details including the original advertising details. When using a mobile device it is important to keep the size of the Wiki low for performance. I plan to have many of these USD's so If I had a quick way of dragging and dropping or importing external file links it would be helpful. For example I already have 30+ folders containing various content for specific devices such as routers, disk-stations, TVs, Blue Ray Players even the stove and fridge. The thing is with TiddlyWiki, a Cheap USB drive a OTG cable I can USB enable, even website enable anything I want to. I can even glue the USB drive to those things. I have even contemplated putting low cost USB drives on boxes in storage, photographing the items placed in the box, and making these visible in the "USD" TW. While maintaining a synced copy elsewhere for searching.
Another Use Case
Allowing selective display of Images from a large photo library, or music tracks, curated and placed in a slideshow within a TiddlyWiki that can use tagging and all those features to manage the media. A tiddly-wiki can kind of act as a "PlayList". No these are not transferable, but we do not need to use every feature of tiddlywiki every time.
Please accept my thanks for this beautiful software tool TiddlyWiki, it's open nature makes it resemble "Plasticine" that can be shaped into anything we want. Please never take my apparent criticisms of TiddlyWiki as anything other than because I love it so much and want the best for this gem. And often It is pointed out to me how there is a way already.
Regards
Tony