You can try:
Check if your file is locked. If it is, unlock the file and try again.
Try creating a new document and see if you can move images within the new document.
If you are using "Web Layout" view mode, try switching to a different view mode, such as "Print Layout".
If you are using a shared document, check if you have editing permission for the document.
Try copying and pasting the images to a new location (
my location) within your document instead of dragging and dropping.
If none of these methods work, you can refer to the help documentation or contact the software provider for assistance.