Export map at 70 pixels/cell (or a multiple of 70)

Note: It works best if map cells match page cells exactly (i.e., if page is 20 x 20, map should be 20 x 20 cells and 1400 x 1400 pixels). If map is premade, set the page to a number of cells equal or larger than then picture.

Upload map to Library (into folder for campaign/adventure)

Switch to Map layer

Drag map from Library to Page

Right Click > Advanced > Set Dimensions and set to match the original map

Grab the map and drag until upper right corner is close to the page upper right. It will snap to the grid in the right place

Switch back to Object layer