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First create a document file or picture file using some application.  Then store it on the computer or some directory.

While answering  a question  or  when creating a question,  you will have some buttons in a tow...   You have to click on the   hand - palm like / paper clip like button.  then  drag and drop the document file...  Or enter the path name of the picture file.

see the diagram.

2 5 2
it may work out...
i ll see to it