Offiline map download doesn't work for large viewport

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The problem

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When I've select large viewport (~ >6505 tiles) for offline map download, the dowload current viewport doesn't do anything after click. As a User, I would like to download a large location data (ex: for a whole country) for offline map support. If that is not possible, I would like to see a alert saying not possible to download this big data. (P.S: tested area: country: Bangladesh, city: Dhaka)

Another small point: download offline map is not very intuitive as end-user perspective. User might expect a list of country to download the offline map data.

Steps to reproduce

Technical details

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