Up to 3 files，more 30mb，support jpg、jpeg、png、pdf、doc、docx、xls、xlsx、csv、txt、stp、step、igs、x_t、dxf、prt、sldprt、sat、rar、zip

Up to 3 files，more 30mb，suppor jpg、jpeg、png、pdf、doc、docx、xls、xlsx、csv、txt