How to allow any file type in WordPress
For security reason by default WordPress restrict uploading certain types of file like .SVG, .PDF, .AI, .PSD, .CDR, but if you want, you can remove this restriction by simply adding a line of code in your wp-config.php.
To allow any file type in your WordPress open your wp-config.php file then add this line of code define(‘ALLOW_UNFILTERED_UPLOADS’, true); just above /* That’s all, stop editing! Happy publishing. */ and you are done.
Save your wp-config.php file and upload that into your server. Now try to upload any file you want.