Strictly speaking, it's only your "Arkansas-source" W-2s and 1099-Rs that are absolutely necessary and required for the Arkansas Department of Finance and Administration (a.k.a. Revenue Department) to process your state tax return.

However, in order to avoid any (possible) delay caused by the state ever wanting to see your other W-2s and 1099-Rs at a later date, it's simply a good preventative step to include them all together.  If you have multiple states in which to file, and so you would face running out of original "tear-off" documents, then plain photocopies of your W-2 or 1099-R are an acceptable substitute.

Thus, while there may be only be a legal requirement to send Arkansas-source income W-2s and 1099-Rs, purely as a precaution, we would respectfully recommend including all those you have.  If Arkansas doesn't need them, then they'll just ignore them.  But if they want to see them, before releasing a state tax refund for example, that way they'll have them already.

Thank you for asking this question.