upload files

I have a problem with uploading files using upload file and multiselect. I set it up intuitively, but when I want two or more files and email them the form doesn't jump to the next page and a white page appears.

see it here: - http://testvaz.cz.uvds510.active24.cz/index.php?option=com_content&view=article&id=7&Itemid=101

I left debug on

is there any guide on how to do this properly in chronoforms 7.
I don't know where I'm going wrong and I haven't found the exact description anywhere

if you get a white page then this is an error, try to enable the joomla error reporting and find what is the error shown ?

yes, it says this

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 20480 bytes) in /www/doc/www.testvaz.cz/www/libraries/src/Log/LogEntry.php on line 126

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 65536 bytes) in /www/doc/www.testvaz.cz/www/libraries/vendor/composer/ClassLoader.php on line 571

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 102400 bytes) in Unknown on line 0

what do I have to do to upload files?

I have created a new form where there is only an upload fields field and a send button.

I increased the memory on the server to 512MB.

On further testing I found that the upload files itself does not cause the problem.
The above error is caused if I send an admin email and I want to attach these files as an attachment.

This happens if the file is larger than 2MB.

How can this be fixed?

Please try with a different simple form (just an upload) on the same website, does it have the same issue ?