When I want to import large files, nothing happens?
In order to import long lists of fields (in mass record updater for example), you have to change settings of PHP in PHP.INI (using the Windows Manager, go to Settings > Configure servers > PHP or go to \AgileBio\LabCollector\conf).
The variable to add is
max_input_vars = 10000;
By default on recent PHP versions, the limit is set to 1000 variables.
Once changed, restart Apache.