Can you give me your URL by email? <my username on this forum>@<the domain name of this forum>

Hi cybermcm,

Very strange. Let's see that together :-)

If I open the page of a photo from 2017, the URL of the photo is :

_data/i/upload/2017/05/01/20170501215623-552ab312-me.jpg => works fine

and a photo from 2013 :

_data/i/galleries/kids/2013/2013-01-08_Paul_01-me.jpg => fails fine! "could not load" photo.

Now if I force Piwigo to load the photo through PHP :

i.php?/galleries/kids/2013/2013-01-08_Paul_01-me.jpg => works fine!

It means the file is there and can be read. But I also see that if I try to open directly _data/i/galleries/kids/2013/2013-01-08_Paul_01-me.jpg in my browser, I'm redirected to index.php?/category/43

Don't you have some .htaccess files in _data/i/2013 which automatically redirect the visitor?

Can you try to activate this setting in the local configuration (with plugin LocalFiles Editor):

<?php
$conf['derivative_url_style'] = 2;
?>

cybermcm wrote:

I do not have a .htaccess file but I've a global Redirect rule in place, my bad..... after removing my rule everything seems to work fine again.

Good :-)

cybermcm wrote:

my initial question: is it correct that files reside in 4 different folders?

Yes :

* _data/i : cache for multiple sizes
* upload : where Piwigo stores photos added with the web form or remote applications
* galleries : where you manually add photos (by FTP, for example)