I just wanted to pass this bit of information on to those like me who are new to installing and configuring Omeka.
I was having trouble uploading large and multiple files into my archive. Anything above 5 or 6MB seemed to simply not load. I looked around for settings within the Omeka install files that might explain the problem, but could not find what was keeping me from uploading large files or large amounts of files.
My hosting service is DreamHost, so I emailed their customer service, and they responded with he following:
"The default upload limit is set to 7MB on the server. You can increase
that to anything you like by adding a custom phprc file to your FTP
Since your site is running on PHP 5.3, all you need to do is upload a
folder to your 'username' on your FTP account called /.php/5.3. In that
folder, create a text file called phprc (without an extension). In that
file you can add any commands you like such as this:
upload_max_filesize = 20M
post_max_size = 25M
max_execution_time = 500
max_input_time = 500
After the limit is set higher you shouldn't have any further issues with
this. Please let us know if you have any further questions."
What they meant by "folder" was that I needed to create a ".php" directory in my root directory on the server, and inside the ".php" directory place another directory named "5.3". It worked perfectly. Once I knew what I was doing, I was able to find this link to more detailed descriptions about how to configure phprc and php.ini files:
I would imagine this information might be helpful to those using a different hosting service, but who are also running PHP 5.3 or 5.4.