Hi Tautech. It was not storing the displays I was having trouble with. it was retrieving them after, to compare. I have now worked it out, after a lot of button pushing. To display a stored file.. PRESS FILE Using the Up/Down buttons select the required file.... Press OPEN / LOAD on the On screen menu. Easy when you know how. It is a shame Siglent do not cover this important feature in their User Manual.