A field cannot be a tab control and a tab control cannot be a field. So your description here is a bit confusing. What is a "tab box"?
How do you "try to put in a jpg"? Are you pasting from the clipboard? Doing a Drag and Drop or selecting an Insert option from the insert menu?
And is the field optimized for interactive content?
A screen shot of your layout, captured while the layout is in layout mode, may be helpful.