unequal sampling effort

Hi, I have become confused in my reading of analysis of proportions. I was all set to analyse my data using a general linear model after transforming the proportions using an arcsine-square root transformation, but now I'm not sure if this is a correct approach and more importantly why/why...

How to take into account heterogeneity in sampling effort in a binomial glm (presence absence) ? Edit I want to link species presence with environmental variables. But, species data come from camera trapping and camera traps didn't work the same total period (some cameras worked during 50...