Make sure the path to the file is correct. Your HTML code should not be referring to your personal computer A drive or C drive.
Check the file names. File names are case sensitive and no spaces and punctuation marks are allowed. Some programs will change your filenames to all capital or all lowercase letters when uploading.
Make sure the extensions are correct. You can use .htm or .html but when you make links you have to use the exact file name.Why are my images displayed as broken links? Assuming the image files have been uploaded to the server, the problem is likely: