Uhh, no. InfinityFree does not support uploading PDF files. In fact, if you take a look at the knowledge base, they’re specifically listed as one of the file types that are automatically deleted after uploading.
No! There is no reason you should have to use CHMOD on InfinityFree. Files already have the correct permission to be used, edited, and executed.
@Rufoelgrande if you’re uploading those PDF templates to your InfinityFree site, you’re not going to be able to do that, despite the false advice you’ve been given. Instead, upload them to a third-party file hosting service like @Greenreader9 suggested, and publish download links to them on your website.