A new number will be assigned when you have told TAL about the new Object, and the information has been accepted into the database. Make sure you keep a note of this number when it appears later, you will need it when you set up your question. The operations which follow will only set up one external, you have to repeat the operations for each new external. Thus if the question has several images, they will all have separate numbers. This part of TAL is not well defined at present, the images are held in a directory, not in the Oracle database.
Classification is therefore a big problem.
Choose between the existing Web resource and storing the resource in the database Location - of the resource, either on the Web, or in the computer running the database . Note that this is entered with a browse box. Watch for a new window opening. Parameters , depend on the resource Accept Changes and Discard Changes - when the above are entered Upload will appear when the above are correct and accepted. As an example the structural formula for question 7 of Will Brand and David Rolls was set up with ChemDraw and saved as a gif file.