.ipt file extension not working

Thanks for the reply.
I already did that with no success. Some file types started to work, but at least this one is failing to upload.

I just switched the website to online and you can check the form here:
https://varishapes.com/orcamentos/

This is my entry at the form:
[mfile Uploadmodelo filetypes:art|blp|bmp|bti|cd5|cit|cpt|cr2|clip|cpl|dds|dib|djvu|egt|exif|gif|grf|icns|ico|iff|jng|jpeg|jp2|jps|lbm|max|miff|mng|msp|nift|otb|pbm|pc1|pc2|pc3|pcf|pcx|pdn|pgm|pi1|pi2|pi3|pict|pct|png|pnm|pns|ppm|psb|psd|pdd|psp|px|pxm|pxr|qfx|raw|rle|sct|sgi|rgb|int|bw|tga|targa|icb|vda|vst|pix|tiff|tif|ep|vtf|xbm|xcf|xpm|zif|3dv|amf|awg|ai|cgm|cdr|cmx|dp|dxf|e2d|egt|eps|fs|gbr|odg|svg|xml|stl|cad|vrml|x3d|sxd|tgax|v2d|vdoc|vsd|vsdx|vnd|wmf|emf|art|xar|3dmf|3dm|3mf|3ds|abc|ac|amf|an8|aoi|asm|b3d|blend|block|bmd3|bdl4|brres|bfres|c4d|cal3d|ccp4|cfl|cob|core3d|ctm|dae|dff|dpm|dts|egg|fact|fbx|g|glb|glm|gift|glft|iob|jas|lwo|lws|lxf|lxo|ma|max|mb|md2|md3|md5|mdx|mesh|m|mm3d|mpo|mrc|nif|obj|off|ogex|ply|prc|prt|pov|r3d|rwx|sia|sib|skp|sldasm|sldprt|smd|u3d|usd|usda|usdc|usdz|vim|vimproj|vrml97|wrl|vrml|vue|vmx|wings|w3d|x|x3d|z3d|3dt|aty|cag|fes|mgmf|mm|mmp|tpc|3dxml|3mf|acp|amf|aec|ar|art|asc|asm|bin|bim|brep|c3d|ccc|ccm|ccs|cad|catdrawing|catpart|catproduct|catprocess|cgr|ckd|ckt|co|drw|dft|dgn|dgk|dmt|dxf|dwb|dwf|dwg|easm|edrw|emb|eprt|escpcb|escsch|esw|excellon|exp|f3d|fcstd|fm|fmz|g|gbr|glm|grb|gtc|iam|icd|idw|ifc|iges|ipn|jt|mcd|mdg|model|ocd|par|pipe|pln|prt|psm|psmodel|pwi|pyt|skp|rlf|rvm|rvt|rfa|s12|scad|scdoc|sldasm|slddrw|sldprt|dotxsi|step|stl|std|tct|tcw|unv|vc6|vlm|vs|wrl|x_b|x_t|xe|zofzproj|gcode|ipt|IPT|.ipt|.IPT]

At the end I tried every option.

Do you think there is some solution?
Thank you.

I just sent the file to your email for testing. thank you.

Problem seems to be solved!
Thank you so much for your help!
Great plugin!