Can't upload files, getting error message.

See File Uploading and Attachment

Thanks but That file doesn’t help or explain the errors. I set the limit to 15 mg, I can’t upload 3.5 mg files but I can upload 1.8 mg files????
Here is my code. <p>Your Name (required)
[text* your-name] </p>

<p>Your Email (required)
[email* your-email] </p>

<p>Subject
[text your-subject] </p>

[file file-874 limit:15728640]

<p>Your Message
[textarea your-message] </p>

<p>[submit “Send”]</p>

The folder had rights and my

Check PHP settings.

https://php.net/manual/en/features.file-upload.common-pitfalls.php