Steven Zahm@ Darrin
The cause is the the ../wp-includes/default-constants.php seems to have been replaced with either an older or an altered version. The file being used does not include new constants included in WP 4.4 for byte sizes. They are; KB_IN_BYTES, MB_IN_BYTES, GB_IN_BYTES and TB_IN_BYTES.
Because those constants were not set it would cause the core WP function wp_max_upload_size() to return a 0 value. Fortunately the wp_max_upload_size() function includes a filter named upload_size_limit.
Add added a new filter in the ../wp-content/plugins/connections/includes/inc.plugin-compatibility.php which check for those constants and then set them so the wp_max_upload_size() function will function correctly.
This should resolve the upload issue. Hope that helps!