Trying to upload a pdf File with 1.52MB results in the following crash:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 2136725 bytes) in /var/www/vhosts/http://xxx.xxx/xxx.xxx/libraries/joomla/database/driver.php on line 1676

The max upload in the the PHP system is 16 MB
Changing the Upload size in Matukio -> Configuration -> Security
- didn't help
- when changed to "6MB" it gave an error message without crashing, suggesting that the uploaded file was too large (which is not the case).

Are we overlooking something or might there be a bug?

Thanks for your help.