Setting the pixel density will determine at what density an artboard is exported.
For example, if 2x is selected, an artboard that is 500x500 pixels will be exported and uploaded at twice the size (1000x1000 pixels). Selecting 1x will export and upload the artboard at its original size.
Note: If your prototypes are loading slowly in InVision, you can reduce the file size and increase the loading speed by setting the pixel density to 1x.
To set the default pixel density in Craft:
In the Mac menu bar, click the Craft Manager icon ().
Click the gear icon (), and then click Preferences.
Click the Sync tab.
Under Exported pixel density, click the drop-down and select 1x or 2x.