I copy the images in my clipboard and save them in an HTML file to have single-file galleries:
https://gist.github.com/egeozcan/b27e11a7e776972d18603222fa5...
Live:
https://gistpreview.github.io/?b27e11a7e776972d18603222fa523...
Selecting via file-picker works too. Dragging usually does not. When all works, images are inserted inline as blobs.
After adding images, if you save the page (literally file->save), the blobs are saved together. don't want a part when saving (for example, removing images)? inspect element, remove, save page.
throw the page on some server or just double click on your computer/mobile.
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