I have just created some tiles on my project on QGIS with the plugin Qtiles; now I get several tiles in .png! My question is, how could put these tiles .png on QGIS Server? Is it possible?
From what I understand of QTiles, it seems you have to create your own server to serve those tiles or put them in a WMTS server.
QGIS Server is not a WMTS Server. One workaround might be to use Lizmap plugin and its cached and tiled option. Lizmap will come on top of QGIS Server to publish layers as tiled cached WMS layers. Most parts of the documentation are in french though.