This is a big problem for me as well, as I use the file:/// hyperlinks daily on a lot of stuff.
The workaround with the Drag & Drop is not ok for me because it adds a lot of clutter to my files/notes. For example, I could have the word "Pay" and hyperlink it to an external excel file, but if I drag and drop it it takes 10-20 times as space in width, has a border around it, file extension, logo and file size, padding, and it breaks the line. If I have Pay 1, Pay 2, Pay 3.... Pay 10, now I can't have them all in 1 row, I have 1 row for each file, with extra irrelevant info and padding between them. I can't format it, change colors, font, highlight etc. Huge difference.
Hope this is fixed fast.