I cannot upload files over 2MB, (photos, files etc.) to my prestashop

[Leolautzu]

I cannot upload files over 2MB, (photos, files etc.) to my prestashop

my prestashop is 1.7.8.2, I use ionos as hosting.
I need to upload photos/files larger than 2Mb on product pages.
How can I do this?
I tried adding the following lines to the htaccess file( but they would send the site to error 500): 

memory_limit= 50M
upload_max_filesize= 10M
post_max_size= 10M
max_execution_time= 300
max_input_time= 600
memory_limit= 720M

I have problems finding the php.ini file and I am not sure if the change is to be made in this file. 
Can anyone help me?

[juanrojas]

Hello, do you mean the images of the products? if so, why do you want to do this? it will only make your site slow

[Leolautzu]

Yes, but not only for images. I want to make full use of the photographer's images for the first photo, and be able to upload heavier downloadable product sheets.