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I am building a website for an estate agent.
I need to enable the estate agents employers to be able to add new properties with images & possibly some HTML can
this be done with TP?
Yes, of course, it can be done via the Write panel, which is accessible for all levels of (registered) users. For trying out really quickly which panels and which elements on these panels are accessible for the respective users install smd_faux_role. (Open file, copy garbled text and paste on Admin > Plugins)