I am relatively new to 3DP but have had some success. I've seen many of the self-help videos and read through the forums. Recently I replaced a fan, and then started to encounter a problem with adhesion (yes, don't see the connection either). Naturally I assumed it was the printer, so I spent hours re-leveling, looking at glue sticks, etc. Then it dawned on me that perhaps it wasn't me or the printer, but the file I downloaded? During the print it always seemed to fail right at a small circular unconnected high feature. So I thought perhaps I could add a brim that might increase my odds of success. However, I uploaded the file to Cura and now it states "Print setup disabled. G-code file can not be modified". So what to do?