Collada Mesh Export with Multiple Textures

[micheus]

The import to Second Life with textures attached didn't work, ...

Did you moved the project or images used by it to another place?
I ask because the exported file should contain the full path to the images and that could be a cause for images didn't be imported in SL.
Otherwise, or we have a problem with the exporter or the SL importer doesn't understand the file being read.