Module blocks are OpenCart modules that can be used in the Page Builder just like the other blocks. In order to use an OpenCart module as block you must first export it.
|OpenCart 2 module export|
Go to Admin > System > Design > Layouts > TB_Widgets. In the module table, add the modules you want to export. You need to enter a unique sort order for each different module. Position is of no importance.
Do not change sort order once assigned to a Page Builder row! If you change the sort order of an assigned module block, it will disappear from the store and will be marked with red color in Page Builder.