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Hello @rui9075918
Thank you very much for using our plugin.
The selector for the images previews is:
#fbuilder .cff-file-field .files-list imgSo, 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.
