Missing feature!
Open all images from a given directory - select and auto order them as sequence of pages in one ODF file and/or export them as PDF.
Simply Combine / Merge multiple images into one file.
This feature exists in LibreOffice since the 4.1 branch. It is not included in Writer. A sequence of images makes more sense in a presentation. So this is included in Impress.
Open Impress, click on menu Insert > Image > Photo Album, select all the images you want from as many folders as you wish. Re-order them (manually) if they are not in the order you wanted. Choose how many images you want per slide and click on Insert Slides.
You can save the presentation to make modifications later or simply go to File > Export as PDF
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I know this doesn’t really address your feature request, but I find GIMP quite useful for making PDF documents - you can import images as layers, then make them into a pdf easily.
The problem with GIMP’s PDF exportation is it saves each pic as a separate page, which at least in Foxit Reader makes the PDF not readable in continous mode. This is true with GIMP 2.8.16 and Foxit Reader 7.2.8.1124.
Since the above answer is an older answer, I would like to provide my own approach that I found more recently. I use LibreOffice Draw to open the images. You can open the images into a page. You can create new pages by right-clicking in the pages section and selecting the new page option. Then you can drag your images into a page and export as pdf. If you open multiple images at the same time, they’ll get opened into their own Draw instance. You can just drag images into the Pages section of one instance to get all the images in the same Draw.
I recommend using lossless compression to preserve image quality during the export. My use case was combining multiple scanned paystubs into a single pdf with some information redacted. I imported the .png files from my scanner into Draw, redacted the information with rectangles over sensitive areas, and then exported to .pdf with lossless compression. If screenshots of the process would be helpful, let me know and I can follow up with another comment! Fortunately I found the LibreOffice suite to be very intuitive so far. Amazing work by the LibreOffice developers and maintainers.
Note that if the resulting pdf is too large for uploading to various portals, you can use some compression to reduce the quality of the images by 50% to 90% and see significant reductions in file size while still maintaining excellent image quality.