Occasional images scanned to a hot folder can fail to appear in Volume, this is often down the 'polling' process stopping. Exiting Volume and logging back in will re-start the process. If the problem remains, follow the steps below to determine the reason. You will need to know the location of your hot folder.
To do this you will need 'superuser' access. Click 'File'->'System Setup' and select the 'Jump\Remote Scan' tab.

N.B. Your system may be set up with multiple hot folders.
Volume needs full control of the hot folder. To test this when logged in to windows as the windows user that will be running Volume, type the full hot folder address into the windows 'run' box (Win+R).

Once in the folder test that the user can create and delete files.

If you cannot create and remove files, adjust the permissions accordingly.
Next, you need to check the permissions of files created by the scanner.
With Volume shutdown, scan a document. The image file will appear in the hot folder. The user should be able to delete the file. If the user cannot delete the file then please adjust the permissions accordingly.
Some incompatible items may have been inadvertently transferred in to the hot folder. These items can cause the 'polling' process to fail. When the user logs out and then back in to Volume the polling process is restarted, but if the incompatible item is still in the hot folder the polling process will fail again when it tries to process the incompatible item.
To resolve this issue:
If steps 2 & 3 do not resolve the issue then it may be that the image the scanner is creating is not compatible with Volume. To test this, turn on debug by pressing CTRL-ALT-D together, then drag/drop the image from the hot folder to your desktop, then from the desktop to the 'Pages to be Placed' bar if the image does not appear on the 'Pages to be Placed', then the file must be of the wrong compression type and an error will eventually appear.
It is important that the correct compression and file type are selected otherwise Volume will not process the images. The TIFF file format can produce a single file containing multiple pages and should be selected in the options. This format will keep the pages in order. CITT Group 3/4 compression type is supported which will produce simple black and white images (not grey scale). LZW is also supported for TIFF where both black/white and colour images are both supported in the same multi-page file. If LZW is not supported then JPEG can be used. This must be set to True or Full colour..