LIMITED POWER OF ATTORNEY - SECURITIES LAW COMPLIANCE

          The undersigned, as an officer or director of Dropbox, Inc. (the
"Corporation"), hereby constitutes and appoints Ajay Vashee, Bart Volkmer and
Mary Anne Becking, each the undersigned's true and lawful attorney-in-fact and
agent to complete and execute such Forms 144, Form ID, Forms 3, 4 and 5 and
other forms as such attorney shall in his or her discretion determine to be
required or advisable pursuant to Rule 144 promulgated under the Securities Act
of 1933, as amended, Section 16 of the Securities Exchange Act of 1934, as
amended, and the rules and regulations promulgated thereunder, or any successor
laws and regulations, as a consequence of the undersigned's ownership,
acquisition or disposition of securities of the Corporation, and to do all acts
necessary in order to file such forms with the Securities and Exchange
Commission, any securities exchange or national association, the Corporation and
such other person or agency as the attorney shall deem appropriate.

          The undersigned hereby ratifies and confirms all that said attorneys-
in-fact and agents shall do or cause to be done by virtue hereof.  The
undersigned acknowledges that the foregoing attorneys-in-fact, in serving in
such capacity at the request of the undersigned, are not assuming, nor is the
Company assuming, any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934 (as amended).

          This Limited Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4 and 5 with
respect to the undersigned's holdings of and transactions in securities issued
by the Corporation unless earlier revoked by the undersigned in a writing
delivered to the foregoing attorneys-in-fact.

          This Limited Power of Attorney is executed as of the date set forth
below.

                                        Signature:   /s/ Timothy Regan
                                                   -----------------------------

                                        Print Name:  Timothy Regan
                                                     ---------------------------

                                        Dated:       March 22, 2018
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