I'm having trouble being able to upload an excel file into a dynaform and displaying it on a grid in a second dynaform. I followed the instructions of installation for both PhpSpreadsheet and Composer.phar as described in this link: https://wiki.processmaker.com/3.1/Grid_Control#Importing_spreadsheet but when we run our process the following _ERROR_ message appears on the debugger: Composer autoloader could not be found. Install dependencies with `composer install` and try again.
I already have PhpSpreadsheet-master uploaded on my server on /bpm/processmaker/shared and also the composer.phar on /bpm/processmaker/shared/PhpSpreadsheet-master with -rwxrwxr-x permissions. The bootstrap.php is pointing towards the autoload.php correctly, so I don't understand why it can't find it.
We are using PHP 7.1.33 as well.