Is there a way to get drawings to snap to grid?

I'm new to Roll20 and tabletop games in general, and as such I don't really have or know where to find the resources long time players might have in regards to tokens, maps, etc., which means that so far I've mostly been drawing my maps on my own. The Roll20 drawings tools have been helpful for this, but one thing that lends me no end of frustration is that once a shape, or any drawing, has been drawn, even if it was originally snapped to the grid, there is no way to get it to snap back to the grid once moved. Indeed, this seems to be a feature rather than a bug (it is possible to turn a token into a drawing in order to prevent snapping to grid, but no function for turning a drawing into a token, unless the entity originated as a token), and every search I've done for this problem comes up with results of people trying to figure out how to turn off  the snap to grid functions. While I understand why snap to grid can be annoying at times, and not desirable for images imported from outside Roll20, the sheer volume of those queries has prevented me from finding anyone with a similar problem to mine. Is there any better solution to this than simply creating the desired images on a grid external to Roll20 and importing them?

That's an I retesting question. What are you trying to do where you need snapping after having drawn the drawing?  Maybe there is a solution to that sub case.  Something you might try is placing a token on the grid and selecting it and the drawing together, then moving them together. That might cause the token to snap and thereby snap the drawing. 

While that is a good suggestion, upon testing it does not seem to hold up. When selecting and moving a token and a drawing at the same time, it appears that the drawing will stay wherever dropped while the token snaps to the grid independently of the drawing. As for what I want to do, all I want is to be able to precisely draw my own (admittedly crude) maps in Roll20 without having to zoom all the way in to see if the pixels match. The lack of grid snapping is especially a problem with large shapes that need rotation because small errors tend to accumulate. Theoretically I could draw all the shapes in place and never move them, but for that I'd need to know exactly how the map would come together before I'd drawn any of it.

Some potential help: Use shift-click to draw as much of the image as possible.  It will snap to corners. If you use the arrow keys rather than the mouse to move an object, it will move one square at a time. Alt-Arrow key moves your selection a couple of pixels at a time. If you have a drawing that is not lined up w/ the grid, but you want to move it like it is, use aaron's suggestion, but don't use the mouse.  Use the arrow keys fairly slowly so the selected objects don't become de-synched. Good luck and happy rolling!   

Three of Swords said: 2. If you use the arrow keys rather than the mouse to move an object, it will move one square at a time. I did not know this! This is very helpful. Likewise about Alt-arrow. I think this solves my problem, although simply having a toggle for grid snapping seems more intuitive. Thank you. Edit: Interestingly, selecting both a token and a drawing and moving both at the same time with the arrow keys produces some weird behavior regarding the token both snapping to the grid and not snapping to the grid (I don't really know how to describe it). Depending on circumstance the token either moves slowly until it's inside the drawing or it simply keeps moving in a direction until it's off the screen. This isn't really a problem, but it is a bizarre edge case.

I totally agree with Three of Swords.

Edit: Interestingly, selecting both a token and a drawing and moving both at the same time with the arrow keys produces some weird behavior regarding the token both snapping to the grid and not snapping to the grid (I don't really know how to describe it). Depending on circumstance the token either moves slowly until it's inside the drawing or it simply keeps moving in a direction until it's off the screen. This isn't really a problem, but it is a bizarre edge case. I've seen this as well.  I'm not sure what causes it.  And it doesn't seem to happen all of the time.  Overall though, it works so I use it.