Up to 3 files，more 30mb，suppor 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, each no larger than 30MB. Supported formats: jpg, jpeg, png, pdf, doc, docx, xls, xlsx, csv, txt, stp, step, igs, x_t, dxf, prt, sldprt, sat, rar, zip.