To quickly create images optimized for the StickyFolios builder, consider creating a Lightroom preset. Here is how to set up a Lightroom preset for this purpose.
Set up your Lightroom StickyAlbums Preset
In the Library module, choose File > Export to open up the Export dialog box. In the Export dialog box, specify the export settings you want to save. Choose the following settings:
Export To: Hard Drive
Export Location: choose your folder
File Naming: rename your file if you wish
Image Format: JPEG
Quality: 85
Color Space: sRGB
Resize to fit: checked, Width & Height, we recommend between 1000 and 3000 pixels on the longest edge for the Folios builder and for the orignal classic builder 1600 pixels on the long side.
Resolution: 72
Output Sharpening: Sharpen for Screen, Amount: Standard
Save your Preset
Click Add at the bottom of the Preset panel on the left side of the dialog box. In the New Preset dialog box, enter "StickyAlbums Image" in the Preset Name box and click Create.
Use your StickyAlbums Image Export Preset
Select the image(s) you would like to export.
Select the "StickyFolios Image" preset from the left side of the dialog box
Choose your export location
Click Export
Here are more detailed instructions from Adobe:
Exporting Photos from Lightroom