Robot lawn mowers typically don’t use plastic bags for grass collection. Most models have a built-in grass catcher or a collection system, but they usually work by dropping the grass clippings back onto the lawn as mulch. This helps nourish the soil. Some higher-end models might offer options for clipping collection, but they’re not designed to use traditional plastic bags like a push mower would. If you’re looking for a bagging option, you might want to check if your mower model offers any specific accessories or attachments for collection.
I think John meant collecting dog 
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@Mik_Bennett and anyone else with a Mammotion Luba mini.
Help please. My mower has only cut our lawns about 4 times over the summer - so hot and dry the grass didn’t grow, so the blades underneath are free of any grass and look quite fresh still.
Will the mower app tell me when I need to clear grass from underneath and when to replace the blades? How often do you do so?
You get about a bit @graceyee - India, Australia. Convince me you are not a bot (perhaps you like cutting lawns).
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No Sue, I don’t think the mower tells you when to clear grass underneath. What it does do is stop and send you a message if the motor starts to get hot. This happens when then disk finds it difficult to turn (which could possibly be the result of grass build up). Once the motor cools it tries again. In bad conditions it can keep doing this until the battery eventually drains. This is a problem for me because I tend to just set and forget. It might be a day or so before noticing that the thing needs attention.
Just before buying, at the start of this season, I lurked on some of the Facebook forums and one useful suggestion was to remove the washer between the blade and the disk. This makes the blade swing more freely and does reduce grass jamming below the blade. Apparently, the makers endorse this idea and when you buy new blades they come with replacement screws but no washers.
In one season so far, I have replaced one complete set of blades and am less than halfway through the spare pack that came with the robot. The blades have a sharp edge both sides. There are two holes in the blade so you can change to the other cutting edge when one is worn out. There is a little engraved logo to help you remember which side you are using. Blade wear depends on what you are mowing and how big it is. I am mowing more than the area recommended. Since the canicule broke we have lots of molehills which the robot just ploughs through. Also, there are lots of fallen apples which it turns to mulch, so my blades get a fair hammering. I would suggest that two sets of blades are more than enough for one season.
I find it easier when changing the blades to remove the whole disk first by unscrewing the three bolts with the hexagonal driver supplied with the kit. This allows you to apply a good deal of pressure on the screws holding the blades. They only have a shallow slot for the screwdriver so it can easily slip out. Also, I bought a small tube of Loctite on Amazon to apply before returning the blade screws. I am not sure if it is necessary but better than having a very sharp blade come off because of a loose screw. They are very sharp and the dogs would discover them in no time.
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My experience is the opposite. Unless I grease or oil the screw thread before fitting I find that they seize up & are thus very hard to remove. One really needs to clean the screw heads to get a proper fit for the correct screwdriver otherwise slippage is almost inevitable.
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These particular screwheads have very shallow slots so even with the right sized screwdriver you still need a fair amount of pressure to stop the screwdriver slipping out.