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To do so, long tap the picture until a menu appears. The image will be copied to the Clipboard (temporary storage) on your device. If it's in a different app from the one in which you're copying, open the other app. The image will be inserted into the document or field at the place where you put the cursor.
Select the image you want to copy. Tap Copy. Long tap on a document or field where you want to insert the image. Tap Paste.