Why does my ZTE Quartz say insufficient space when there is plenty of room?

My phone displays insufficient space When I try to download any apps. I have plenty of room in my phone storage And have an external SD card in my phone as well. The SD card is completely empty, But it still says I have insufficient space And won't let me download anything new.

Check phone memory. Make sure it has enough space for the file you are downloading.

I would like to know the answer to that question, as well.

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