Adobe has amazing options when it comes to what you can do with relation to fitting images into frame, or vice versa. To fit an object (image) into a frame, select the image. If you want to paste more than one image, make the multiple images into one group, as a frame selects only one image. If you want to paste a text frame into an image frame without having its content altered, select the entire text frame using Selection tool or Direct Selection tool, not the Type tool. Apply Edit: Copy; Apply Edit - Cut if you do not want to paste the original text.; Once you have selected a frame or path, apply Edit - Paste Into.; Likewise, to fit an object into a frame automatically, do the following: Select the frame of the graphic; Go to Object > Fitting, from which you can opt for any of these choices: Fill Frame Proportionally: To resize content to fill up the frame completely and proportionately; Fit Content Proportionally: To resize content to fit a frame without changing the content proportions or the frame’s dimensions; Content-Aware Fit: To automatically fit an image inside the frame based on the frame size and image content without changing the frame's dimensions; Fit Frame To Content: To resize a frame to fit its content while altering the frame’s proportions to suit the content proportions, if needed; Fit Content To Frame: To resize the content to fit a frame while allowing the content proportions to be changed, without changing the frame; Center Content: To place the content within the center of a frame without altering the proportions of the frame and its content or the size of the content and frame. These and other details concerning this feature can be had from this Adobe page.