That is *Normal flux residue* and has no effect on circuit.
Re file size,
When you load attachments it tells you the file size limit;
*maximum individual size 5120KB*
If it helps,,
Download this;
https://www.irfanview.com/I've used this for years and could not work without it
Does just about anything you throw at it,,, and it's FREE!
Load your pic and from the drop down menu called *Image* click *Resize/Resample* (or hit Control R)
Now click on *Half size*,, hit OK.
Then *Save AS* select *File Type* as a *JPEG*
That will reduce a 7Meg file down to maybe 500kb.
Don't forget to rename the file if you want to keep the original.
HTH, Phil.
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