Upload files “images” | WordPress.org

Hello @rui9075918

Thank you very much for using our plugin.

The selector for the images previews is:

#fbuilder .cff-file-field .files-list img

So, If you want to increase the size of image previou and border, you can enter the style definition below through the “Customize Form Design” attribute in the “Form Settings” tab:

#fbuilder .cff-file-field .files-list img{
width:300px !important;
border: 2px solid blue !important;
}

Best regards.