You must be a team owner to add or change a team picture.
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On the left, select
Teams and then find your team. -
Next to the team name, select the ellipsis (...) and then select
Manage team. -
Select the Settings tab and, under Team details, select Change picture.
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Select Upload. Choose a new picture and then select Open and Save.
Tip: For your personal profile picture, see Add or change your profile picture or icon