I tried uploading some files via Upload/Images using the current version of zenphoto and received an error that "upload.php" is missing. I checked the filesystem and indee the file is missing. So, how can I upload stuff via the ordinary web-interface?

There is no file named "upload.php", there are "uploader.php" ones within "zp-core/admin-httpupload" and "zp-core/admin-upload.php". MAke sure you really installed everything correctly.

You have the choice between a flash multifile upload, the normal form upload and even directly via FTP.

Because the installation routine is fully automatic the error quote is quite low I guess. I took 2 screenshots, see for yourself.

//the upload-Button I was talking about
http://i56.tinypic.com/34zkpiq.gif

//thats what I got after "clicking" on upload
http://i51.tinypic.com/1zqr41c.gif

Besides that, the green "hochladen" bzw. "upload"-button shows no reaction at all.

Because the installation routine is fully automatic

What installation routine is automatic? If you didn't install the way described on our site please do so now. If you used any install helper application you need to contact the vendor of it.

I think you misunderstood me. With "automatic" I meant "copying the files into a folder onto my webserver and then calling setup.php" via a webbrowser. And currently there is only one installation step missing; ENJOY

I skimmed over the php files located at ../zp-core/admin-httpupload. And finally upload_form.php caught my attention, it contains the following line:

<form id="file_upload" action="upload.php" method="POST" enctype="mulitpart/form-data">

The part action="upload.php" explains my error. IMHO it is a typo and should be action="uploader.php".

Indeed I missunderstood. Regarding the possible typo we will take a look.

The line you cite is part of the flash upload--are you using the flash upload? If so it really does not matter what this action says since it is never invoked.

BTW, I did just test uploading with the flash uploader and it did work just fine.