you may have problems with the current version of php on a Backlight 1 site.
But to your question. you need to increase the upload_max_filesize in your php.ini file.
You may be able to download and edit this file from the root of your site via ftp. Or you might need to have your host increase the max_upload_filesize setting.
For some reason Puplisher has started to create quite big photo & thumpnail files compared to older albums. I managed to reduce the size to 900 KB - 1,3 MB. Thumpnails are of same size. But still publisher creates too big files and I get this error message.
The photos used to be around 100 KB and thumpnails around 25 KB. I haven’t changed settings in between - until now. I redused the photo size to 640 px and thumpnail size to 100 px in Template / Design / Image settings.
Yes, they are using correct template. I have only one template designed. And, when I made the image size changes to that template, marked my collection in TTG Publisher to republish and then published the collection, the created files on my site are now smaller, but not small enough.
Propably this is the point where I should upgrade to Backlight 5.
Sounds like you’re getting bitten by the renditions bug that was introduced by Adobe some months ago. We posted updates, of course, and sent out a newsletter with the subject “IMPORTANT”.
In short, Adobe made a breaking change in their API, and older versions of publisher no longer respect your width/height settings for renditions. The impact is that publisher now exports thumbnails as full-size images. Not good.
We fixed this in Backlight 2 and newer. We very strongly advise an upgrade.
If you’re intent on trucking on with Backlight 1, though, then see here: